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  • azimuth angle

    The included angle between the projection of the line from the center of the sun to the observation point on the ground ...

  • solar elevation angle

    The included angle between incident sun rays and the horizontal plane.

  • solar declination

    The included angle between the line from the center of the Earth to the center of the Sun and the equatorial plane (such ...

  • hour angle

    The included angle between the projection of the Sun on the equatorial plane at a certain moment and the projection of t ...

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