Sail Smart by AppSail · Episode 3
The Equatorial Coordinate System
The conventions from the episode on four pages: declination and hour angle side by side, how GHA, LHA, SHA and right ascension are counted, the GHA-to-LHA rule with worked examples, a full star chain from Aries and polar distance.
Download the PDFAppSail — sailors helping sailors
A free app for sailors: find crew and boats, ask for help in port, discover marinas, services and sailing events near you.
Educational material. It does not replace official nautical publications, charts or almanacs.