The 8th Annual NASS conference will take place in
Tucson, AZ Sept. 26-29, 2002. John Carmichael will be our local
host. The bus tour this year will feature a trip to Kitt Peak and a visit
to John's own workshop. Registration info will be sent with the June issue
of The Compendium.
But i
Hello
Anselmo,
The
derivation of the equation of the center shown below is given in W. M. Smart's
classic "Textbook on Spherical Astronomy". This topic is covered on pages
116 to 120 of the Sixth Edition (1977) that I picked up in a used book store
years ago.
The
proof is too long to
Hello Anselmo,
The formula for the perimeter of a circle is easy to write down,
assuming you now the value of pi. There is no such simple formula for
the perimeter of ellipses. Some good places on the web to start
reading about this are
http://home.att.net/~numericana/answer/ellipse.htm
Jean Meeus's "Astronomical Algorithms" gives five abbreviated coefficients
for terms up to sin 5M. He references
"Annales de l'Observatoire de Paris," Vol. I, pages 202-204, and only says
that it is derived from a series expansion.
The abbreviated coefficients are
2e - (e^3}/4 + (5/96)e^5
(5
Hi dialists,
Maybe this is an off-topic, but I found it in some
gnomonics books and I'd like to know more about it:
It is well known that due to Kepler's Second Law
the Earth (and any satellite) does not follow a circular
uniform movement but an elliptical non-uniform one.
So the longitud
