Monthly Archives: May, 2026

J2000, Equinox, and Epoch: Reading a Star Catalog Correctly

Telescopes and Observing May 19, 2026

Galileo’s Inclined Plane: Why a Famous Museum Model Rings Bells

Galileo and the Classics May 18, 2026

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What Is a Planet’s Hill Sphere—and Why Can’t Moons Orbit Anywhere?

October 31, 2026

Why Do Galaxy Clusters Look Stretched in Redshift Maps?

October 30, 2026

How Do Satellite Magnetorquers Turn a Spacecraft Without Propellant?

October 29, 2026

Telescope Back Focus vs. Corrector Spacing: Why Both Matter

October 28, 2026

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