Under Mordred's bed in Mordred's House (The museum).
The numbers for the coordinates are located on her thing she puts notes on [above the telescope]. You jump from thumbtack to thumbtack to find the coordinates! [Sorry if this does not help, but I'm pretty sure that is where the coordinates for the school are located]
The planet Poptropica and its nearby Pewter Moon are at X-56 Y-52 in the Poptropica solar system. When you are launching the saucer Excalibur, you will find these coordinates under Mordred's bed, on the missing page from his journal. (see related question)
the coordinates are 56, 52 but you have to get the fuel rod
To find the telescope in Poptropica, you need to go to the main street of CJ's school and use the map to locate the telescope. Once you're there, click on the telescope and interact with it to have a closer look. The coordinates are C-6.
56,52
The coordinates for the jungle planet are (15,15). Poptropica is (50,50). The ice planet is (73,83). and the lava planet is (83,20).
The coordinates for the telescope on Poptropica vary depending on the island you are on. You will need to provide the specific island you are playing to get the accurate coordinates.
The planet Poptropica has the same coordinates as the Pewter Moon : X-56 Y-52.
Click on the lower right picture to find the written coordinates and use the numbers on the lower left to tell where you are. match the coordinates to find the planet. This is made easy on the ice planet because it will warn you about space sharks when your near it.
56 52
it is 15,15
In the game Poptropica Astro-Knights, when finding the crashed alien ship and trying to enter coordinates a message will pop up saying "Not Enough Fuel to Reach Destination." Instead of needing to find more fuel, one needs only to find a different set of coordinates in Mordred's Journal. Entering the coordinates (56,52) will result in the ship launching.