Sunday, October 16, 2011

Celestial Navigation by TI-36X Pro

The TI-36X Pro is an excellent value calculator for celestial navigation sight reduction. Enter the formula for calculating altitude into the NUM-SOLVE function then follow the prompts for variable entries.

Calculated altitude formula:
a=ArcSin(Cos(x)Cos(d)Cos(t) ± Sin(x)Sin(d))

x= Latitude
d= Declination
t= Meridian Angle
a=Calculated Altitude

Use the OP function to solve for azimuth Z.

Key the SET OP function and enter the formula:

Once (a) is solved in NUM-SOLVE then azimuth Z can quickly be solved in the OP function with one key push.

Convert calculated altitude (a) into degrees minutes and seconds using the MATH menu DMS6 or multiply degree fraction by 60 to get minutes and tenths.


  1. Hi Greg. I've come here via Popps's bits and bobs blog and through our mutual correspondent Serge L from JOOBLE. I'm curious to see whether there are links between our respective blogs. So far , and you're the third I've visited, I can't see much of a connection, other than perhaps our wish to communicate to others about our interests and our lives in whatever way we can. I don't see much of a wish to either search for or to advertise jobs. I'm pleased to meet you, Greg.

  2. Thanks for visiting Elisabeth. My blog is sure to bore you ;-) But if you have a sailing spirit then there is food for thought here. Navigation is a primary interest and this post features a most impressive inexpensive pocket calculator that is absolutely useless for writing inspiration. Still something to be worth having even if it becomes a paperweight on your desk taunting each verse with numbers. G