Are you saying that the moon casts a shadow in a lunar eclipse? My problem is that my teacher has not even begun to mention anything about this in class, and has not provided any resources for me. I'm just trying to learn how to calculate the radius of the umbral and penumbral circle in a lunar...
I found a completely different equation:
penumbral radius: Rp = 1.02 * (0.998340 * Pm + Ss + Ps)
umbral radius: Ru = 1.02 * (0.998340 * Pm - Ss + Ps)
where: Pm = Equatorial horizontal parallax of the Moon...
Homework Statement
Find the radii of the umbra and penumbra circles drawn drawn perpendicular to the EMS axis, formed at a distance equal to that of the moon from the Earth.
Homework Equations
(From: http://www.opticiansfriend.com/articles/equations.html#Shadows)
D2 / L1 = (P + U) /...