How to build a telescope | IR Poyser – Telescope Makers
How to Make a Telescope (with Pictures) - wikiHow
When building a refracting telescope, does the diameter of the eyepiece matter? And why do we need to move the eyepiece (as in my textbook) if the image is always focused at
Extremely Large Telescope - Wikipedia
What are some of the factors that Astronomers consider when deciding the location for a telescope? - Quora