The coordinates are X-56 Y-52 (from the missing page of Mordred's journal). You can only enter the coordinates after you have replaced the green fuel rod.
(see related questions)
On the saucer Excalibur, you must enter coordinates before the ship will launch. (see related question)
The coordinates X-56 Y-52 are for the nearby Pewter Moon. You input these numbers on the dials to launch Excalibur (you must replace the fuel rod first). The numbers are on the torn page from Mordred's Journal, which is under his bed. (see related questions)
The coordinates for the Pewter Moon are on the missing journal page (X-56 Y-52). Once the fuel rod is replaced in the saucer Excalibur, you can enter these coordinates into the launch computer. (see related question)
Once you have the hovercraft from the attic of the mill, you can bring the fuel rod to the saucer (Excalibur) and use it to launch into space. The cordinates are X-56 Y-52.
You have to fix the saucer by obtaining a new fuel rod. There is one in the robot invader held in the dungeon. Once it is replaced, you can dial in the coordinates to launch the saucer. (see related questions)
You have to fix the saucer by obtaining a new fuel rod. There is one in the robot invader held in the dungeon. Once it is replaced, you can dial in the coordinates to launch the saucer. (see related questions)
The solution to Astro Knights Island is at the related question below. Your quest is to rescue the Princess, who has been kidnapped by robot invaders and taken into space. Find and repair the saucer Excalibur and launch into space, to find the three planets where space knights are searching for the princess. Defeat the robot monsters on the planets using the Mystical Weapons of Arturus, then face the Binary Bard in his castle in another galaxy. (see related solution question)
Write down 56 52
56, 52
x-56 y-52
If you have recovered the Missing Journal Page with the coordinates to the Pewter Moon (X-56 Y-52), you can repair the saucer Excalibur and fly it there. Get a new fuel rod for the saucer and then enter the coordinates to launch. (see related question)
To fix the damaged Excalibur you need a new fuel rod. You can get one from the robot invader in the dungeon. The missing page of Mordred's Journal should have the coordinates for the nearby moon. You won't have enough fuel to reach the planets on the Queen's list. (see related questions)