Astrology

Astrology is a skill that provides passive buffs to various other skills in the game similar to the Agility skill. Modifiers will be unlocked as you level up your mastery in each constellation, and the buff can be upgraded by spending Stardust or Golden Stardust to level up that buff to a maximum level of 5 for Golden Stardust buffs and 8 for Stardust buffs.

Astrology

This article is about the Astrology skill. For training the skill, see Astrology/Training.

Mechanics

Leveling Astrology involves Studying various Constellations, starting with the Deedree Constellation at level 1. Studying has a base interval of 3 seconds per action. Studying does not cost any resources and provides Astrology experience and Mastery experience for the Constellation after each action.

Each Study action also has a chance to provide Stardust, Golden Stardust, or to ( ) discover a Meteorite.

Acquiring Stardust

Both Stardust and Golden Stardust are exclusively obtained from Astrology. Both are acquired at random while studying constellations, where Stardust and Golden Stardust drops with a 5% and 2% chance per action respectively.

The rate at which stardust may be acquired can be increased by:

Decreasing the action interval
- The Secret Stardust Potion reduces the action interval by 3/5/10/15% depending on the potion's tier. Note that since the potions themselves use Stardust as an ingredient, maximising the Herblore preservation and doubling chances before creating any of these potions is highly recommended.
- The Superior Astrology Skillcape reduces the action interval by 10%.
Increasing the drop chance(need rework)
- For Stardust, the 25% Mastery pool checkpoint provides a +5% bonus to the drop chance.
- For Golden Stardust, the 50% Mastery pool checkpoint provides a +3% bonus, the 95% Mastery pool checkpoint provides a +2% bonus, and Astro provides a +1% bonus to the drop chance.
- For Meteorite Ore, the 95% Mastery pool checkpoint provides a +2% bonus
Increasing the drop quantity
- Equipping the Astrology Skillcape provides a +1 bonus to the quantity of both Stardust and Golden Stardust that is dropped.
- Equipping the Superior Astrology Skillcape provides a +2 bonus to the quantity of both Stardust and Golden Stardust that is dropped.

Modifiers

Each constellation starts with 6 different predetermined modifiers. Each modifier will start with 0% bonus. You can use Stardust or Golden Stardust to upgrade it to 8%(standard) or 5%(unique) bonus. Each upgrade gives a 1% bonus.

Upgrading standard modifiers costs Stardust, while upgrading unique modifiers costs Golden Stardust.

The first upgrade needs 10 Stardust or 50 Golden Stardust. With each upgrade, the cost of Stardust or Golden Stardust will double.

Each standard modifier requires 2550 Stardust to max out, and each unique modifier requires 1550 Golden Stardust to max out. This results in a total of 84,150 Stardust ( 114,750 Stardust) and 51,150 Golden Stardust ( 69,750 Golden Stardust) needed to max out every modifier in astrology.

Mastery Unlocks

Item Mastery Unlocks

Level	Unlock
20	Unlock another Star (Unique Modifier)
40	Unlock another Star (Standard Modifier)
60	Unlock another Star (Unique Modifier)
80	Unlock another Star (Standard Modifier)
99	Unlock another Star (Unique Modifier)

Mastery Pool Checkpoints

Pool %	Pool XP	Bonus
10%	800,000 xp	+5% increased Astrology Mastery XP
25%	2,000,000 xp	+5% chance to find Stardust
50%	4,000,000 xp	+3% chance to find Golden Stardust
95%	7,600,000 xp	+2% chance to find Golden Stardust and Meteorites
Total Mastery Pool XP		8,000,000

Skillcape

The skillcape can be purchased from the store for 1,000,000 after the player reaches Level 99.

Skillcape	Name	Requirements	Effect
	Astrology Skillcape	Level 99	+1 to base drop quantity of Stardust and Golden Stardust from Astrology
	Superior Astrology Skillcape	Level 120	+2 to base drop quantity of Stardust and Golden Stardust from Astrology -10% Astrology Interval

Pet

The pet can be unlocked by doing any Astrology action.

Pet	Name	Effect
	Astro	+1% chance to locate Golden Stardust in Astrology

Constellations

The bonuses listed below are the maximum possible.

Constellation		Level	XP	Skills	Standard Stars		Unique Stars
Constellation		Level	XP	Skills	Level	Modifiers	Level	Modifiers
	Deedree	1	5	Woodcutting Farming	1	+8% Woodcutting Skill XP +8% Farming Skill XP	20	+5% Chance for Bird Nests to drop in Woodcutting
					40	+8% Woodcutting Mastery XP +8% Farming Mastery XP	60	+5% Farming Yield
					80	+8% Chance to Double Items in Woodcutting +8% Chance to Double Items in Farming	99	+5% chance to receive Stardust when cutting Magic Logs in Woodcutting (Quantity equal to Logs received)
	Iridan	10	13	Attack Smithing	1	+8% Attack Skill XP +8% Accuracy Rating	20	+5 Hidden Attack Level
					40	+8% Smithing Skill XP +8% Smithing Mastery XP	60	-5% Smithing Interval
					80	+8% Chance to Double Items in Smithing	99	+5% of Maximum Hit added to Minimum Hit
	Ameria	20	21	Fishing Firemaking	1	+8% Fishing Skill XP +8% Firemaking Skill XP	20	+5% chance to receive Special Items from Fishing
					40	+8% Fishing Mastery XP +8% Firemaking Mastery XP	60	-5% Fishing Interval -5% Firemaking Interval
					80	+8% Chance to Double Items in Fishing +8% Chance to Double Items in Firemaking	99	+5% chance to receive a Diamond per action in Firemaking (Cannot be doubled).
	Terra	30	29	Strength Mining	1	+8% Strength Skill XP +8% Accuracy Rating	20	+5 Hidden Strength Level +5% Melee Strength Bonus from Equipment
					40	+8% Mining Skill XP +8% Mining Mastery XP	60	+5% Chance to receive gems from Mining (Does not work for Rune Essence)
					80	+8% Chance to Double Items in Mining	99	+5% Chance to deal no Damage to an Ore or Essence Mining Node
	Vale	40	37	Hitpoints Cooking	1	+8% Hitpoints Skill XP +8% Accuracy Rating	20	-5% Cooking Interval
					40	+8% Cooking Skill XP +8% Cooking Mastery XP	60	+5% Lifesteal
					80	+8% Chance to Double Items in Cooking	99	+5% Food Healing Value +5% Chance to Preserve Food when eaten
	Nysa	45	41	Archaeology Cartography	1	+8% Archaeology Skill XP +8% Cartography Skill XP	20	-5% dig site map refinement cost
					40	+8% chance to preserve dig site map excavation actions	60	-5% Cartography survey interval
					80	+8% Archaeology Mastery XP	99	+5% Chance to Double Items in Archaeology +5% Chance to Double Items in Cartography
	Syllia	50	45	Ranged Fletching	1	+8% Ranged Skill XP +8% Accuracy Rating	20	+5 Hidden Ranged Level +5% Ranged Strength Bonus from Equipment
					40	+8% Fletching Skill XP +8% Fletching Mastery XP	60	+5% Ammo Preservation
					80	+8% Chance to Double Items in Fletching	99	+5% Chance to gain +1 additional resource in Fletching (Cannot be doubled)
	Arachi	60	53	Magic Runecrafting	1	+8% Magic Skill XP +8% Accuracy Rating	20	+5 Hidden Magic Level +5% Magic Damage Bonus from Equipment
					40	+8% Runecrafting Skill XP +8% Runecrafting Mastery XP	60	+5% Rune Preservation for Alt. Magic Spells
					80	+8% Chance to Double Items in Runecrafting	99	+5% Chance to receive random Elemental Runes from Runecrafting when creating Runes
	Ko	70	61	Agility Thieving	1	+8% Thieving Skill XP +8% Agility Skill XP	20	-5% Thieving Interval -5% Agility Interval
					40	+8% Thieving Mastery XP +8% Agility Mastery XP	60	+5% GP From Agility
					80	+8% Chance to Double Items in Thieving	99	+50 Stealth while Thieving
	Tellus	80	69	Defence Slayer	1	+8% Defence Skill XP +8 Hidden Defence Level	20	+5% Slayer Coins
					40	+8% Slayer Skill XP	60	+5% Damage To Slayer Area Monsters
					80	+8% GP From Monsters	99	+5% Reflect Damage
	Hyden	90	77	Prayer Crafting	1	+8% Prayer Skill XP	20	-5% Crafting Interval
					40	+8% Crafting Skill XP +8% Crafting Mastery XP	60	+5% Chance to gain +1 additional resource in Crafting (Cannot be doubled)
					80	+8% Chance to Double Items in Crafting	99	+5% Chance To Preserve Prayer Points
	Qimican	95	85	Summoning Herblore	1	+8% Herblore Skill XP +8% Summoning Skill XP	20	-5% Herblore Interval -5% Summoning Interval
					40	+8% Herblore Mastery XP +8% Summoning Mastery XP	60	+5% Chance To Preserve Potion Charge
					80	+8% Chance to Double Items in Herblore +8% Chance to Double Items in Summoning	99	+5% Chance to preserve Summoning Charges
	Variel	100	155	Astrology	1	+8% Astrology Skill XP	20	-5% Astrology Interval
					40	+8% Astrology Mastery XP	60	+2.5% chance to locate Golden Stardust in Astrology
					80	+2% chance to locate Stardust in Astrology	99	+0.5% chance to locate a Meteorite in Astrology
	Haemir	105	235	Township	1	+8% Township Skill XP	20	+5% Township Happiness
					40	+8% Township Resource Generation	60	-5% Township Building Cost (Does not affect GP cost. Capped at -80%)
					80	+8% Township Maximum Storage	99	+5% Township Education
	Rosaniya	110	335	Woodcutting Fishing Firemaking Cooking Mining Smithing Farming Thieving Fletching Crafting Runecrafting Herblore Agility Summoning Astrology Township	1	+8% chance to receive a Quality Superior Gem while Mining Gem Veins or Meteorite Ore	20	+5% Global GP (except Item Sales)
					40	+8% Chance to Double Items Globally	60	+50 Bank Space
					80	+4% chance to locate Stardust in Astrology	99	+5% Global Mastery XP
	Ashtar	115	475	Attack Strength Defence Hitpoints Ranged Magic Prayer Slayer	1	+8% Auto Eat Efficiency	20	-5% Attack Interval
					40	+8% Damage To Slayer Tasks	60	+5% Flat Slayer Area Effect Negation
					80	+8% Chance To Double Loot in Combat	99	Target Damage Reduction is decreased by flat 5%

Potions

The Secret Stardust Potion reduces the interval for Study actions.

Secret Stardust Potion
Potion	Tier	Charges	Effect
	I	5	-3% Astrology Interval
	II	10	-5% Astrology Interval
	III	15	-10% Astrology Interval
	IV	25	-15% Astrology Interval

The Star Seeker Potion increases the chance of finding Golden Stardust.

Star Seeker Potion
Potion	Tier	Charges	Effect
	I	15	+1% chance to locate Golden Stardust in Astrology
	II	25	+2% chance to locate Golden Stardust in Astrology
	III	35	+3% chance to locate Golden Stardust in Astrology
	IV	50	+5% chance to locate Golden Stardust in Astrology

Summoning Boosts

This table shows all the Summoning Familiars and Synergies that provide a bonus to Astrology.

		Effect
Owl		-5% Astrology Interval
Devil	Owl	Adds an additional +4 to regular stardust drops, gain no golden stardust
Eagle	Owl	-10% Astrology Interval

Skill Boosts

This table lists most sources of Astrology-specific modifier boosts. For a list of boosts that apply to all skills, see the Skill Boosts page. This list does not contain boosts provided from Mastery rewards.

Source	Type	Astrology Boosts	Other Modifiers
Waterfall	Agility Obstacle 10	-5% Astrology Interval +5% Astrology Mastery XP +5% Astrology Skill XP
Forest Climb	Agility Obstacle 14	-10% Astrology Interval +0.5% chance to locate Golden Stardust in Astrology +1.5% chance to locate Stardust in Astrology	-6% Global Skill XP
Rosaniya	Constellation	+4% chance to locate Stardust in Astrology	+50 Bank Space +8% chance to receive a Quality Superior Gem while Mining Gem Veins or Meteorite Ore +8% Chance to Double Items Globally +5% Global GP (except Item Sales) +5% Global Mastery XP
Variel	Constellation	-5% Astrology Interval +2.5% chance to locate Golden Stardust in Astrology +2% chance to locate Stardust in Astrology +0.5% chance to locate a Meteorite in Astrology +8% Astrology Mastery XP +8% Astrology Skill XP
Secret Stardust Potion I	Item	-3% Astrology Interval
Secret Stardust Potion II	Item	-5% Astrology Interval
Secret Stardust Potion III	Item	-10% Astrology Interval
Secret Stardust Potion IV	Item	-15% Astrology Interval
Star Seeker Potion I	Item	+1% chance to locate Golden Stardust in Astrology
Star Seeker Potion II	Item	+2% chance to locate Golden Stardust in Astrology
Star Seeker Potion III	Item	+3% chance to locate Golden Stardust in Astrology
Star Seeker Potion IV	Item	+5% chance to locate Golden Stardust in Astrology
Star Gazing Boots	Item (Boots)	+2% Astrology Skill XP
Astrology Skillcape	Item (Cape)	+1 to base drop quantity of Stardust and Golden Stardust from Astrology
Cape of Completion	Item (Cape)	+1 to base drop quantity of Stardust and Golden Stardust from Astrology	Bypass Slayer Area item requirements for areas that require less than level 100 Slayer -20% Agility Obstacle Build Costs -50% Prayer Point Cost for Prayers (Prayer Point cost cannot go below 1) -0.5s Thieving Interval -0.5s Crafting Interval -15% Woodcutting Interval -15% Cooking Interval -50% Coal Costs for Smithing -15% Township Building Cost (Does not affect GP cost. Capped at -80%) x2 Items received from Fishing x2 Items received from Fletching x2 Items received from Herblore Create +5 Additional Runes of the same type in Runecrafting +50% Ammo Preservation +1 Coal Ore per Ore Mined. (Item doubling does not apply) +100% chance to receive Ash per log burnt in Firemaking +2% Global Perfect Cook chance +100% chance to successfully Cook an item +15% Chance to Double Items in Runecrafting +5% Damage To Slayer Tasks +25% Farming Yield +100% chance to receive coal when burning logs in Firemaking +10% GP From Agility +100% GP From Thieving +5% Global Skill XP +10 Flat Hitpoints Regeneration +25% Mastery Pool XP Cap Items that reduce Rune costs are now 2x as effective +20% Chance to Preserve Resources in Summoning +25% Flat Slayer Area Effect Negation +10% Chance to preserve Summoning Charges +10 Base Quantity for Summoning Tablet Creation +150 Stealth while Thieving
Maximum Skillcape	Item (Cape)	+1 to base drop quantity of Stardust and Golden Stardust from Astrology	Bypass Slayer Area item requirements for areas that require less than level 100 Slayer -20% Agility Obstacle Build Costs -50% Prayer Point Cost for Prayers (Prayer Point cost cannot go below 1) -0.5s Thieving Interval -0.5s Crafting Interval -15% Woodcutting Interval -15% Cooking Interval -50% Coal Costs for Smithing -15% Township Building Cost (Does not affect GP cost. Capped at -80%) x2 Items received from Fishing x2 Items received from Fletching x2 Items received from Herblore Create +5 Additional Runes of the same type in Runecrafting +50% Ammo Preservation +1 Coal Ore per Ore Mined. (Item doubling does not apply) +100% chance to receive Ash per log burnt in Firemaking +2% Global Perfect Cook chance +100% chance to successfully Cook an item +15% Chance to Double Items in Runecrafting +5% Damage To Slayer Tasks +25% Farming Yield +100% chance to receive coal when burning logs in Firemaking +10% GP From Agility +100% GP From Thieving +5% Global Skill XP +10 Flat Hitpoints Regeneration Items that reduce Rune costs are now 2x as effective +20% Chance to Preserve Resources in Summoning +25% Flat Slayer Area Effect Negation +10% Chance to preserve Summoning Charges +10 Base Quantity for Summoning Tablet Creation +150 Stealth while Thieving
Superior Astrology Skillcape	Item (Cape)	-10% Astrology Interval +2 to base drop quantity of Stardust and Golden Stardust from Astrology
Superior Cape of Completion	Item (Cape)	-10% Astrology Interval +2 to base drop quantity of Stardust and Golden Stardust from Astrology	Bypass All Slayer Area item requirements -30% Agility Obstacle Build Costs -20% Agility Pillar build costs -75% Prayer Point Cost for Prayers (Prayer Point cost cannot go below 1) -0.8s Thieving Interval -0.8s Crafting Interval -20% Woodcutting Interval -25% Cooking Interval -10% Summoning Interval -75% Coal Costs for Smithing -20% Township Building Cost (Does not affect GP cost. Capped at -80%) x2 Items received from Fishing x2 Items received from Fletching x2 Items received from Herblore Create +8 Additional Runes of the same type in Runecrafting +75% Ammo Preservation +1 Bolts produced per action in Fletching +2 Coal Ore per Ore Mined. (Item doubling does not apply) +50% Chance to gain +1 additional bar in Smithing (Cannot be doubled) +100% Chance to gain +1 additional resource in Fishing (Cannot be doubled) +100% Chance to gain +1 additional resource in Fletching (Cannot be doubled) +15% Chance to gain +1 additional resource in Crafting (Cannot be doubled) +100% Chance to gain +1 additional resource in Herblore (Cannot be doubled) +20% Chance to Double Farming Yield +100% chance to receive Ash per log burnt in Firemaking +100% chance to receive Charcoal per burn in Firemaking +4% Global Perfect Cook chance +100% chance to successfully Cook an item +20% chance to avoid the stun interval and stun damage in Thieving when pickpocket attempt fails +25% Chance to Double Items in Runecrafting +1% chance to find a Lost Chest while Fishing (This is separate to the Special Fishing Chance) +5% Chance to Preserve Food when eaten +5% Chance To Preserve Potion Charge +5% Chance To Preserve Prayer Points +8% Damage To Slayer Tasks +40% Farming Yield +100% chance to receive coal when burning logs in Firemaking +20% GP From Agility +150% GP From Thieving +5% Chance to find gem veins when Mining +8% Global Skill XP +15 Flat Hitpoints Regeneration +5% Lifesteal +5% Magic Damage Bonus from Equipment +5% Melee Strength Bonus from Equipment +1 minimum Bird Nest's received from Woodcutting +5% of Maximum Hit added to Minimum Hit +5% Ranged Strength Bonus from Equipment +5% Reflect Damage +10% Rune Preservation Items that reduce Rune costs are now 4x as effective +25% Chance to Preserve Resources in Summoning +35% Flat Slayer Area Effect Negation +10% Slayer Coins +15% Chance to preserve Summoning Charges +10 Base Quantity for Summoning Tablet Creation +10% Summoning Maximum Hit +270 Stealth while Thieving
Superior Max Skillcape	Item (Cape)	-10% Astrology Interval +2 to base drop quantity of Stardust and Golden Stardust from Astrology	Bypass All Slayer Area item requirements -30% Agility Obstacle Build Costs -20% Agility Pillar build costs -75% Prayer Point Cost for Prayers (Prayer Point cost cannot go below 1) -0.8s Thieving Interval -0.8s Crafting Interval -20% Woodcutting Interval -25% Cooking Interval -10% Summoning Interval -75% Coal Costs for Smithing -20% Township Building Cost (Does not affect GP cost. Capped at -80%) x2 Items received from Fishing x2 Items received from Fletching x2 Items received from Herblore Create +8 Additional Runes of the same type in Runecrafting +75% Ammo Preservation +1 Bolts produced per action in Fletching +2 Coal Ore per Ore Mined. (Item doubling does not apply) +50% Chance to gain +1 additional bar in Smithing (Cannot be doubled) +100% Chance to gain +1 additional resource in Fishing (Cannot be doubled) +100% Chance to gain +1 additional resource in Fletching (Cannot be doubled) +15% Chance to gain +1 additional resource in Crafting (Cannot be doubled) +100% Chance to gain +1 additional resource in Herblore (Cannot be doubled) +20% Chance to Double Farming Yield +100% chance to receive Ash per log burnt in Firemaking +100% chance to receive Charcoal per burn in Firemaking +4% Global Perfect Cook chance +100% chance to successfully Cook an item +20% chance to avoid the stun interval and stun damage in Thieving when pickpocket attempt fails +25% Chance to Double Items in Runecrafting +1% chance to find a Lost Chest while Fishing (This is separate to the Special Fishing Chance) +5% Chance to Preserve Food when eaten +5% Chance To Preserve Potion Charge +5% Chance To Preserve Prayer Points +8% Damage To Slayer Tasks +40% Farming Yield +100% chance to receive coal when burning logs in Firemaking +20% GP From Agility +150% GP From Thieving +5% Chance to find gem veins when Mining +8% Global Skill XP +15 Flat Hitpoints Regeneration +5% Lifesteal +5% Magic Damage Bonus from Equipment +5% Melee Strength Bonus from Equipment +1 minimum Bird Nest's received from Woodcutting +5% of Maximum Hit added to Minimum Hit +5% Ranged Strength Bonus from Equipment +5% Reflect Damage +10% Rune Preservation Items that reduce Rune costs are now 4x as effective +25% Chance to Preserve Resources in Summoning +35% Flat Slayer Area Effect Negation +10% Slayer Coins +15% Chance to preserve Summoning Charges +10 Base Quantity for Summoning Tablet Creation +10% Summoning Maximum Hit +270 Stealth while Thieving
Astrology Lesser Relic	Item (Consumable)	-5% Astrology Interval +2% chance to locate Golden Stardust in Astrology	-3 Prayer Point Cost for Prayers (Prayer Point cost cannot go below 1)
Golden Star	Item (Consumable)	+0.2% chance to locate Golden Stardust in Astrology
Golden Star II	Item (Consumable)	+0.4% chance to locate Golden Stardust in Astrology
Travellers Compass	Item (Consumable)	+0.25% chance to locate a Meteorite in Astrology
Star Gazing Hat	Item (Helmet)	+2% Astrology Skill XP
Star Gazing Body	Item (Platebody)	+2% Astrology Skill XP
Star Gazing Leggings	Item (Platelegs)	+2% Astrology Skill XP
Owl	Item (Summon1, Summon2)	-5% Astrology Interval
Astro	Pet	+1% chance to locate Golden Stardust in Astrology
Sign of the Stars	Upgrade	-10% Astrology Interval