rjvanderbei

Sky Shot: Jupiter and Mercury Meet

by Robert J. Vanderbei The previous zodiacal light posting mentioned that Mercury is currently well-placed to view shortly after sunset in the western sky. Following up on that, I would like to share a picture I took of both Jupiter ...

Sizing Up the Supermoon

by Robert J. Vanderbei The moon’s orbit about the Earth is not a perfect circle—it is slightly eccentric. As a result, during part of its orbit it is a little closer to us than at other times. The ...