Sight Reduction Forms

I wrote these as an aid to the solution of the RYA Ocean Yachtmaster training exercises. They include a diagram which can be completed to establish the local hour angle of an object, for example the Sun:

Sun meridian passage

Sun sight reduction

Star sight reduction

Planet sight reduction

Moon sight reduction


My Pocket Sundial :

This spreadsheet will calculate the shadow angles for a 'flat' type sundial if you enter the latitude in which the sundial is is placed. the shadow stick must be made at an inclination for this latitude and pointing towards true North. It is set up for the hours PM just follow symmetry to get AM

Sundial Spreadsheet