| 11. | The sights are then set using the local hour angle and the declination of whatever astronomical body is being used.
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| 12. | Sidereal hour angle is shown as the angular coordinate, starting at 0?at the left of the chart, and increasing counter-clockwise.
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| 13. | However, if you are somewhere else, then the angle between you and the object is known as its Local Hour Angle.
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| 14. | Sidereal hour angle is shown as the angular coordinate, starting at 0?at the right of the chart, and increasing clockwise.
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| 15. | The local hour angle, " LHA ", is the difference between the AP longitude and the hour angle of the observed object.
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| 16. | Greenwich apparent sidereal time ( GAST ) is the hour angle of the vernal equinox at the prime meridian at Greenwich, London.
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| 17. | The cosine of the hour angle ( cos ( " h " ) ) is used to calculate the solar zenith angle.
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| 18. | The local hour angle, " LHA ", is the difference between the AP longitude and the hour angle of the observed object.
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| 19. | Observing the sun from earth, the "'solar hour angle "'is an expression of time, expressed in angular measurement, usually degrees, from solar noon.
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| 20. | For example, at 10 : 30 AM local apparent time the hour angle is-22.5?( 15?per hour times 1.5 hours before noon ).
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