Moon telescope simulator
Copernicus: Earth-facing · sunlight altitude -19.1° · 18 October 2026 at 12:00 UTC.
Lunar imagery: NASA’s Scientific Visualization Studio, Ernie Wright, LRO/LROC. The sunlight model places the Sun on the lunar equator; real solar latitude varies by about 1.5°.
Magnification is telescope focal length divided by eyepiece focal length. Approximate true field is apparent field divided by magnification; an eyepiece field stop gives a more direct field measurement. The circle’s scale uses the selected date’s lunar diameter.
Enter telescope focal length, eyepiece focal length and apparent field to frame a dated Moon with magnification, field of view and optical orientation.