Finding Stars and Constellations: Gemini, including Pollux and Castor

In order to find the constellation of Gemini, we need to draw a line from Rigel to Betelgeuse in the constellation of Orion and continue it for about 1.5 times the distance between those 2 stars. This will takes to the vicinity of Pollux and Castor, the 2 most brilliant starts in the constellation of Gemini.

Pollux (Beta Geminorum) is a star which has 8.8 times the radius of the Sun. It is located 33.7 light years from Earth.

Castor (Alpha Geminorum) is actually a system of 6 stars. It is located 51 light years from Earth.

Previous Posts

Concepts in Astronomy #1. Introduction
Concepts in Astronomy #2. The Ecliptic
Concepts in Astronomy #3. The Celestial Equator
Concepts in Astronomy #4. Right Ascension
Concepts in Astronomy #5. Declination
Concepts in Astronomy #6. The Celestial Sphere
Concepts in Astronomy #7. Azimuth
Concepts in Astronomy #8. Altitude
Concepts in Astronomy #9. The Equatorial Coordinate System
Concepts in Astronomy #10. The Topocentric Coordinate System
Concepts in Astronomy #11. Equinox
Concepts in Astronomy #12. Solstice
Concepts in Astronomy #13. Rotation Period
Concepts in Astronomy #14. Orbital Period
Concepts in Astronomy #15. Axial Precession
Concepts in Astronomy #16. Axial Tilt
Concepts in Astronomy #17. Finding Planets, Stars and Constellations: Polaris
Concepts in Astronomy #18. Finding Planets, Stars and Constellations: Ursa Major and the Big Dipper
Concepts in Astronomy #19. Finding Planets, Stars and Constellations: Orion
Concepts in Astronomy #20. Finding Planets, Stars and Constellations: Sirius

Credits

- Galaxy image obtained from Pixabay under CC0. No Copyright. The person who associated a work with this deed has dedicated the work to the public domain by waiving all of his or her rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law

- Orion and Gemini Image © 2018 marcusantoniu26. All rights reserved. Created using Stellarium