Jim_Cobb [EMAIL PROTECTED] writes:
I noticed that this time disagrees with the time given in the almanac,
so I thought I should provide more information so as not to impugn the
reputation of the excellent xephem program. The 16:08:17 UT time is
what xephem computes as the time of the full
Tom,
With regard to your posting:
Message text written by INTERNET:[EMAIL PROTECTED]
comfortable arm-chair. If an analemmatic dial is planned for a vertical
declining wall at 55° North, and the latitude on the earth's surface where
this plane would be horizontal to the surface is 35° South,
Philip P. Pappas, II wrote:
There will be a total penumbral lunar eclipse on
Jan. 31. The moon will
pass entirely through the lighter part of the Earth's shadow without
any of
it being in the umbra or darkest portion. I don't know the exact
time of
the event. This is a somewhat rare event. I
Here is the eclipse info from the 1999 Astronomical Almanac (p. A 79).
I meant to include this in the last message, but sent it off too
soon...
Circumstances of the Eclipse
d h m s
UT of geocentric opposition in right ascension,
Frank Evans mentions making an analemmatic dial on a vertical wall. An
article by Peter Drinkwater with just this title was published in the
journal of the British Sundial Society in July 1994 (vol.89.2, p.2).
Peter Tandy
At 02:45 PM 1/25/99 +, you wrote:
Greetings, fellow dialists,
Hi guys, it's me again:
Just thought of another fun experiment we can do during the Jan. 31 lunar
eclipse. One person wrote saying that he doubted there would be enough
light during a prenumbral eclipse to cast a shadow on a sundial. If you
have a photometer, you could measure the minimum
Greetings Dialers:
I'm certain that the penumbrally eclipsed moon will be bright enough to cast a
shadow on the 31st. The planet Venus, when it is close by can cast a shadow
and it is only a -4 magnitude object.
Troy Heck
