Category Archives: Sidereal Times

From Doorstep to Deep Space: Finding the Heart

Posted on May 3, 2026 by ST Editors

by Robert Vanderbei Here’s a picture I took of the Heart Nebula (aka IC 1805) on April 27. The Heart Nebula is an emission nebula.  It resides in the constellation Cassiopeia. It is estimated to be about 7,500 light-years away … Continue reading →

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

Artemis II: A Lunar Flyby with Modern Comforts

Posted on May 3, 2026 by ST Editors

by S. Prasad Ganti More than five decades after the last Apollo flight and three years after the unmanned Artemis I flight to the moon, Artemis II went to the moon along with four astronauts and came back successfully with … Continue reading →

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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 →

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

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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Book Review: Infinite Cosmos: Visions From the James Webb Space Telescope, by Ethan Siegel

Posted on April 5, 2026 by ST Editors

By Richard Sherman Published 2024 Grade:  A $28.32, hardback, at Amazon.com  224 pages “Infinite Cosmos” is a large, coffee table-sized book. It is published by National Geographic, so the production quality is excellent as are the images and diagrams. For … Continue reading →

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Neutrino Astronomy

Posted on April 5, 2026 by ST Editors

By Prasad Ganti Astronomy started out as optical, viewing the light emitted by astronomical bodies in space. Our ancestors looked at the night sky and imagined patterns of stars and distant bodies. Several advances occurred in the last four hundred … Continue reading →

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Short Stories Series

Posted on April 5, 2026 by ST Editors

by Eklavya Doegar, Student, 8th grade Amazing stories from Ancient Astronomy Aryabhata I: The Young Stargazer  A long time ago in the land of India, there lived a boy who couldn’t stop looking up at the skies. This was in … Continue reading →

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