Astronomical Tools for Observing Tonight's Sky - Sky & Telescope
Object Calculator
History of astronomical instruments – Cosmic-Watch
Online Photometry Tool - Astro.SubhashBose.com
13.11.19 Astronomy Tools camera sensor matching to focal length. - Fullerscopes Telescope Mountings
Fullerscopes Telescope Mountings: 13.11.19 Astronomy Tools camera sensor matching to focal length.
Astronomy CCD Calculator - Download & Review
Tutorial: Stellarium Mobile PLUS FoV - ASTROCAMP
Renée Graef Illustration - A merkhet, a time calculator, is one of the oldest astronomy tools (developed in Egypt around 600 B.C.). The illustration is from "T is for Time" by Marie
Eyepiece Selection (Focal Length Selection) - Application Part 2
Astronomical Tools for Observing Tonight's Sky - Sky & Telescope