NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Temperature and pressure
From: Bruce Stark
Date: 2002 Mar 6, 20:10 EST
From: Bruce Stark
Date: 2002 Mar 6, 20:10 EST
Some of the lunarians on the List like to correct their altitudes for the effects of nonstandard temperature and pressure on refraction. I purposely left those corrections out of my lunar distance method as not being worth the extra steps. But Robert Eno was observing lunars in the dead of winter up near the arctic circle. Since it doesn't work to apply the usual extra corrections to the altitudes when using my Tables, I worked out a set of "Cold Weather Increments" for him. It gives a correction to H~H and a correction to Q. I didn't expand the table to include hot weather. If anyone is observing in arctic winter conditions I'll be glad to send a copy of the "Increments." But the main point of this posting is: The usual nonstandard temperature and pressure corrections should not be used with my Tables. Bruce