The two points at which the Sun crosses the celestial equator in its yearly path in the sky. The equinoxes occur on or near March 21 and September 22.  The equinoxes signal the start of the Spring and Autumn seasons.

Equinox

Lagrange Point

French mathematician and astronomer Joseph Louis Lagrange showed that three bodies could lie at the apexes of an equilateral triangle which rotates in its plane. If one of the bodies is sufficiently massive compared with the other two, then the triangular configuration is apparently stable. Such bodies are sometimes referred to as Trojans. The leading apex of the triangle is known as the leading Lagrange point or L4; the trailing apex is the trailing Lagrange point or L5.

Lagrange Point

Orion is the 26th constellation in size, occupying an area of 594 square degrees. It is located in the first quadrant of the northern hemisphere (NQ1) and can be seen at latitudes between +85° and -75°. The neighboring constellations are Eridanus, Gemini, Lepus, Monoceros and Taurus.

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