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> From: "Frank Reed" 

> Of course, if you really want to drive yourself nuts with the
> variation of the Sun's semi-diameter, go to the table for the Sun's
> total altitude correction on the inside front cover of the Nautical
> Almanac. Suppose the Sun's observed altitude was 10d 00'. Suppose the
> date is March 31st locally, but April 1st in Greenwich. So what's the
> altitude correction? According to the table, interpreted very
> literally (!), the correction is 11.0 minutes of arc if it's March 31,
> but it's 10.7 minutes if the date is April 1. Take your pick.

It's not difficult to interpolate for a UL and LL values near the break
point, so one can derive quarterly values, useful for artificial horizons or
beach shots perhaps.  On the water in a small craft I really don't worry
about it.

Bill


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