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The main RuneScape Wiki has an article on: Observatory Quest
The Old School RuneScape Wiki also has an article on Observatory Quest.

Quest details

Name: Observatory Quest
Release date: 17 March 2003 (Update)
Pay-to-play: Yes
Start: Talk to the Observatory Professor in the Observatory Reception Room west of Tree Gnome Village
Difficulty:
*****
Length: Short
Requirements: Level 10 Crafting (due to a bug, this is not actually necessary), able to defend against level-48 Goblin guard.
Items needed: Bronze bar, molten glass, 3 planks. A Cure poison Potion is also recommended.
Monsters to defeat: Goblin guard (optional)
Recommended: Unknown edit

Walkthrough

Starting the quest

Talk to the Observatory Professor and ask to look through his telescope. He tells you that the Goblin residents have been causing trouble and tampered with it. He asks you to collect 3 different items. Hand in all 3 items, and he will return the molten glass while asking you to find the lens mould.

Lens mould

(click to enlarge map)

Go down the ladder in the Observatory post, into dungeon. Go through the maze to the far south west corner and you find a chest containing a keep key. Go to the room where a level-48 Goblin guard is (labeled "keep" on the map), kill him and use key on the gate. Search the sacks to find lens mould.

The Goblin guard does not need to be killed in order to open the gate. It is possible to simply fight him for the first 3 mandatory rounds of combat, retreat and quickly use the key on the gate, which will allow you to pass through it.

Go back to the Observatory post and give the lens mould to the Professor. Agree to help him make the lens. Use molten glass on the lens mould and then talk to the Professor and he will tell you to meet him in the Observatory.

Go back down to the dungeon, and through the maze, and find another ladder north of the chest containing the key to the gate. It leads to the Observatory. Talk to the Professor and look through the telescope to get a constellation.

Constellations

Name Picture Name Picture
Aquarius Constellation Aquarius.png Aries Constellation Aries.png
Cancer Constellation Cancer.png Capricorn Constellation Capricorn.png
Gemini Constellation Gemini.png Leo Constellation Leo.png
Libra Constellation Libra.png Pisces Constellation Pisces.png
Sagittarius Constellation Sagittarius.png Scorpio Constellation Scorpio.png
Taurus Constellation Taurus.png Virgo Constellation Virgo.png

Finishing up

After looking through the constellation, either continue the talk with the Professor or look again through the telescope if you want another roll at the possible constellations, leading to a distinct dialogue case and reward.

Rewards

Quest completed!

Quest reward

Optional: Unholy symbol mould

Grave of Scoprius

Speak to the Spirit of Scorpius, at the graveyard to the north. He will give you an Unholy Symbol mould, which you can use to make Unholy Symbols of Zamorak. If asked, he will also bless these symbols.

Glitch

Although the making of the lens requires a crafting level of 10, it can still be done (without boosting) if the player's crafting level is below that level producing the message:

"Sorry, you need a crafting level
Of 10 or above to use this object
You pour the molten glass into the mould
And clasp it together
It produces a small convex glass disc"

Trivia

  • After you have repaired the telescope talk to the Observatory assistant and he will give you a jug of wine.
  • Once the player finishes the quest, they will always see with the telescope the Scorpio constellation.

See also