| The duration of the apparent solar day is constant throughout a year due to the constant velocity of the earth in its orbit around the sun. |
| The duration of the apparent solar day is constant throughout a year due to the constant rotational speed of the earth around its axis. |
| The apparent solar day is the period between two successive transits of the mean sun through the same meridian. |
| The apparent solar day is the period between two successive transits of the true sun through the same meridian. |
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