heliacal rising การใช้

• The heliacal rising of Pleiades often marks important calendar points for ancient peoples.
• The fourth month includes 20 July, the date of the heliacal rising of Sirius.
• This significance led the Egyptians to base their calendar on the heliacal rising of Sirius.
• When a planet has a heliacal rising, there is a transit, or occultation of the sun.
• For most Earth observers, the heliacal rising of Regulus occurs in the first week of September.
• Currently at the vernal equinox the constellation of Aquarius has been the heliacal rising constellation for some centuries.
• For example, the ancient Egyptians used the heliacal rising of Sirius to predict the flooding of the Nile.
• The same star will reappear in the eastern sky at dawn approximately one year after its previous heliacal rising.
• Every 8 years, Venus passes Regulus around the time of the star's heliacal rising, as on 5 September 2014.
• Because the heliacal rising depends on the observation of the object, its exact timing can be dependent on weather conditions.
• In Persia also the star had significance, since its heliacal rising there also coincided with the coming of the rain.
• Therefore, based on the heliacal rising method, the Age of Aquarius arrived about 1, 080 years earlier than the modern system.
• The rising of a constellation just before sunrise ( its heliacal rising ) was considered the last hour of the night.
• A heliacal rise of Sirius was recorded by Censorinus as having happened on the Egyptian New Year's Day, between AD 139 and 142.
• Just after Sirius has a heliacal rising in the July sky, the Nile River begins its annual flood, and so the ancient Egyptians connected the two.
• 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.
• The Sun passes a little more than 2?north of Spica around October 16 every year, and the star's heliacal rising occurs about two weeks later.
• Each day after the heliacal rising, the star will rise slightly earlier and remain visible for longer before the light from the rising sun overwhelms it.
• Their year began when priests first remarked the asterism heliacal rising in the east, immediately before the sun's dawn light obliterated the view of the stars.
• To the M
  
  ori of New Zealand, the Pleiades are called Matariki, and their heliacal rising signifies the beginning of the new year ( around June ).