The Night Sky Notebook
Equation of Time
Welcome to The Night Sky Notebook
This site offers a range of astronomical calculations and animations.
The calculations used on this site are fairly accurate. The calculations for coordinate conversion, easter, the astronomical clock, telescope, horizon, and stars are exact. Most of the rest of the calculations are very accurate, and are useful for the majority of situations, except where extreme accuracy are required. The calculations for rising and setting times of objects, eclipses, and Jupiter's moons are slightly less accurate, but good enough for visual observations.
If you would like to contact me, you can send an email to Serge Meunier at sjmeunier [at] gmail.com, or visit my blog,
, used to generate the calculations as open source, and is freely available for download from
. If you find this site and library useful, then you are free to use it as you like, although, if you would like to contribute, donations are welcome.
Copyright 2011 -
. This site is best viewed in an HTML5 compliant browser.