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...over an [[observer]]'s [https://en.wikipedia.org/wiki/Meridian_(astronomy) meridian]. ...org/wiki/Sidereal_day sidereal day], an astronomical object will cross the meridian twice: once at its upper culmination, when it is at its highest point as se

...nith. The astronomical [https://en.wikipedia.org/wiki/Meridian_(astronomy) meridian] is also determined by the zenith, and is defined as a circle on the celest [[Category: Astronomy]]

...nts'', p. 8.</ref> away from the [[perpendicular]] to its [[Orbital plane (astronomy)|orbital plane]], producing seasonal variations on the planet's surface wit ...nters the Earth's atmosphere at the magnetic poles, it forms the [[Aurora (astronomy)|aurora]].[https://www-spof.gsfc.nasa.gov/Education/wmap.html] Exploration