Next message: Mike Hannibal: "Re: Lunars"
Bill you wrote:
"...we could be looking at an errors up to 0.5'."
By the way, the angular diameter of Venus is simply proportional to the
planet's horizontal parallax, which you usually have direct access to in almanac
data. For Venus, the angular diamater is just about twice the parallax. For
Mars, it's roughly equal to the parallax. Incidentally, this also works for
the Moon. The Moon's angular diameter is roughly half the Moon's parallax. Note
that the ratios of those factors are nothing more than the ratios of the
actual diameters (in miles, e.g.) of Venus, Mars, and the Moon.
-FER
42.0N 87.7W, or 41.4N 72.1W.
www.HistoricalAtlas.com/lunars
