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25 January, 20:03

Where are you on Earth if you experience each of the following? (Refer to the discussion in Observing the Sky: The Birth of Astronomy as well as this chapter.)

The stars rise and set perpendicular to the horizon.

The stars circle the sky parallel to the horizon.

The celestial equator passes through the zenith.

In the course of a year, all stars are visible.

The Sun rises on March 21 and does not set until September 21 (ideally).

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  1. 25 January, 21:43
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    We know that the sky appears to us like a sphere called as celestial sphere which appears to rotate around an imaginary axis because of Earth's rotation. Since the axis cuts the celestial sphere at celestial poles all the object seems to circle around the celestial poles.

    Condition 1: The stars rise and set perpendicular to the horizon

    The observer is at the equator

    Condition 2: The stars circle the sky parallel to the horizon

    The observer is at the Pole of the Earth

    Condition 3: The celestial equator passes through the zenith

    The observer is at the equator

    Condition 4: In the course of a year, all stars are visible

    The observer is at the equator

    Condition 5: The Sun rises on March 21 and does not set until September 21 (ideally)

    The observer is at North Pole
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