Equatorial coordinate system

High school (ages 12+)
Space & Astronomy

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Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/equatorial-coordinate-system

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the equatorial coordinate system?It is a giant invisible map in space that uses the Earth's equator and poles to help us find stars and planets, like a big sky map.
2. How do astronomers use Declination and Right Ascension?Declination tells how far north or south a star is from the sky’s equator, while Right Ascension tells how far east it is from a special point called the vernal equinox.

Celestial Sphere: An abstract, imaginary sphere of infinite radius centered on the Earth, used as a reference surface for mapping celestial objects.
Declination (dec): The angular distance of a celestial object north or south of the celestial equator, analogous to latitude on Earth.
Right Ascension (RA): The angular distance of a celestial object eastward along the celestial equator from the vernal equinox, analogous to longitude.
Vernal Equinox: The point where the ecliptic intersects the celestial equator, moving westward through the constellations over time, serving as the zero point for RA.