The "Winter Ellipse" is an asterism that includes Rigel, Sirius, Castor, Pollux, Capella, and Aldebaran, the brightest stars in six constellations: Orion, Canis Major, Canis Minor, Gemini, Auriga, and Taurus. On which day will the "Winter Ellipse" be visible on the eastern horizon?December 21Decmber 22December 23

December 21

Explanation:

December 21st are days that has brightest areas on the celestial sphere in which a group of stars forms an imaginary outline or pattern in the sky at sunset, and they are visible all night long during the winter months.)

Due to the rotation of the earth, the stars would seem like they're moving. As the Earth rotates from west to east, the stars appear to rise in the East, moving across south to set in the west.

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