Category Archives: Sidereal Times

The velocity calculations using frequency shift are not accurate

Posted on May 3, 2026 by ST Editors

by William H Davis Why do the text books give different redshift equations for the observer stationary versus the observer in motion? Why do we use the equation for the observer stationary when the Earth is clearly moving through space … Continue reading →

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Snippets

Posted on May 3, 2026 by ST Editors

compiled by Arlene & David Kaplan Telling Time on Other Worlds From Earth orbit to the Moon and Mars, explore the world of human spaceflight with NASA each week on the official podcast of the Johnson Space Center in Houston, Texas. … Continue reading →

Posted in May 2026, Sidereal Times | Tagged , | Leave a comment

From the Director

Posted on April 5, 2026 by ST Editors

by Rex Parker, PhD  director@princetonastronomy.org April 14 Meeting at Peyton Hall.  With the warmer temperatures I will traipse across a blooming campus to Peyton Hall once more for the AAAP meeting on April 14. While walking I look up into … Continue reading →

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From The Program Chair

Posted on April 5, 2026 by ST Editors

by Victor Davis, Program Chair Productive ListeningThe April, 2026 monthly meeting of the Amateur Astronomers Association of Princeton will take place in Peyton Hall on the campus of Princeton University on Tuesday, April 14th at 7:30 PM. As usual, the … Continue reading →

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Minutes of the March 10, 2026 Meeting

Posted on April 5, 2026 by ST Editors

by Gene Allen, Secretary Director Rex Parker opened the meeting in PeytonHall at 1931 with comments about the constellation Leo coming into view, the spring galaxy season, and the upcoming equinox on March 20. There were 26 in the auditorium … Continue reading →

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Note on Merchandise

Posted on April 5, 2026 by ST Editors

by Rich Sherman As we finished a brutal winter, our thoughts now turn to spring and warmer weather. The same is true at your AAAP merchandise shop. On April 15th, we will shift our inventory from the cold-weather gear to … Continue reading →

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