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The Celestial Sphere

The Celestial Sphere. Six Ingredients to Locating Objects on the "Celestial Sphere" . Right Ascension (RA) ~ longitude Declination (DEC) ~ latitude Zero point of RA = Vernal Equinox Zero point of DEC = Celestial Equator Rotation angle of sphere given by Sidereal Time (ST)

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The Celestial Sphere

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  1. The Celestial Sphere

  2. Six Ingredients to Locating Objects on the "Celestial Sphere" • Right Ascension (RA) ~ longitude • Declination (DEC) ~ latitude • Zero point of RA = Vernal Equinox • Zero point of DEC = Celestial Equator • Rotation angle of sphere given by Sidereal Time (ST) • Poles of sphere are inclined according to your latitude

  3. Latitude & Longitude on Earth's Surface

  4. Celestial Sphere

  5. Coordinates on the Celestial Sphere ZP ZP

  6. Sidereal Time (ST) measures the current angular distance of the Vernal Eqx from your meridian

  7. Hour Angle (HA) measures the current angular distance of a source from your meridian measured along the equator.

  8. By knowing HA and DEC, you can locate any object in the sky at a given time.

  9. Visibility of objects depends on DEC and your latitude on Earth

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