| 1. | The heliacal rising of Pleiades often marks important calendar points for ancient peoples.
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| 2. | The fourth month includes 20 July, the date of the heliacal rising of Sirius.
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| 3. | This significance led the Egyptians to base their calendar on the heliacal rising of Sirius.
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| 4. | When a planet has a heliacal rising, there is a transit, or occultation of the sun.
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| 5. | For most Earth observers, the heliacal rising of Regulus occurs in the first week of September.
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| 6. | Currently at the vernal equinox the constellation of Aquarius has been the heliacal rising constellation for some centuries.
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| 7. | For example, the ancient Egyptians used the heliacal rising of Sirius to predict the flooding of the Nile.
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| 8. | The same star will reappear in the eastern sky at dawn approximately one year after its previous heliacal rising.
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| 9. | Every 8 years, Venus passes Regulus around the time of the star's heliacal rising, as on 5 September 2014.
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| 10. | Because the heliacal rising depends on the observation of the object, its exact timing can be dependent on weather conditions.
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