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The Bridge: Discuss an Astronomy Picture of the Day • APOD: A Conjunction of Crescents (2025 Feb 08)

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I'm confused as usual when it comes to 3D stuff. From Wikipedia
In astronomy, a conjunction occurs when two astronomical objects or spacecraft appear to be close to each other in the sky. This means they have either the same right ascension or the same ecliptic longitude, usually as observed from Earth.[1][2]
But "appear to be close to each other in the sky" could mean that two objects are close but don't have either the same celestial longitude or latitude, right? Why is the requirement apparently more strict than that?

celectial coordinate systems.jpg

Statistics: Posted by johnnydeep — Sat Feb 08, 2025 5:22 pm — Replies 1 — Views 110



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