heliacal rising

The end of the night was marked by the heliacal rising of a particular star.

A star will reappear in the eastern sky at dawn approximately one year after its previous heliacal rising.

The heliacal rising of Pleiades often marks important calendar points for ancient peoples.

The heliacal rising of the next decan star marked the start of a new civil week, which was then ten days.

A heliacal year is the interval between the heliacal risings of a star.

This is called a heliacal rising.

The rising of a constellation just before sunrise (its heliacal rising) was considered the last hour of the night.

This significance led the Egyptians to base their calendar on the heliacal rising of Sirius.

"Today's the heliacal rising of the Pleiades.

The heliacal rising of Sothis returned to the same point in the calendar every 1,460 years (a period called the Sothic cycle).

Thus the heliacal rising of Sirius marked the annual flooding of the Nile.

For most Earth observers, the heliacal rising of Regulus occurs in the first week of September.

A 584-day Venus cycle was also maintained, which tracked the heliacal risings of Venus as the morning and evening stars.

The main flooding was associated with observations of the first or heliacal rising of the star Sirius, related to the Sothic cycle.

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For example, the ancient Egyptians used the heliacal rising of Sirius to predict the flooding of the Nile.

The second observation is clearly a reference to a heliacal rising, and is believed to date to the seventh year of Senusret III.

The first inundation according to the calendar was observed in Egypt's first capital, Memphis, at the same time as the heliacal rising of Sirius.

The Dresden Codex contains a Venus table which records the heliacal risings of Venus.

The Sumerians, the Babylonians, and the ancient Greeks also used the heliacal risings of various stars for the timing of agricultural activities.

The months of the lunar calendar are roughly equivalent to the period from early May to the heliacal rising of Sirius around the beginning of September.

There are six pages in the Postclassic Dresden Codex devoted to the accurate calculation of the heliacal rising of Venus.

In ancient Egypt, the date of the annual inundations of farm land by the Nile river was predicted by observing the heliacal rising of a star.

The first heliacal rising of Sirius was used for its prediction and this practice, the observation of some star and its connecting to some event apparently spread.

The flood cycle was so consistent that the Egyptians timed its onset using the heliacal rising of Sirius, the key astronomical event used to set their sidereal calendar.