The heliacal rising (/hɪˈlaɪ.əkəl/hih-LY-ə-kəl)[1][2][3] of a star or a planet occurs annually when it first becomes visible above the eastern horizon at dawn just before sunrise (thus becoming "the morning star") after a complete orbit of the Earth around the Sun.[4] Historically, the most important such rising is that of Sirius, which was an important feature of the Egyptian calendar and astronomical development. The rising of the Pleiades heralded the start of the Ancient Greek sailing season, using celestial navigation,[5] as well as the farming season (attested by Hesiod in his Works and Days). Helical rising is one of several types of risings and settings, mostly they are grouped into morning and evening risings and settings of objects in the sky. Culmination in the evening and then morning is set apart by half a year, while on the other hand risings and settings in the evenings and the mornings are only at the equator set apart by half a year.
^"heliacal". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
^"Show Me a Dawn, or "Heliacal," Rising". Stanford University. Heliacal risings occur after a star has been behind the Sun for a season and it is just returning to visibility. There is one morning, just before dawn, when the star suddenly reappears after its absence. On that day it "blinks" on for a moment just before the sunrise and just before it is then obliterated by the Sun's presence. That one special morning is called the star's heliacal rising.
^"Pleiad". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
The heliacalrising (/hɪˈlaɪ.əkəl/ hih-LY-ə-kəl) of a star or a planet occurs annually when it first becomes visible above the eastern horizon at dawn...
enough time that the start of its year once again coincides with the heliacalrising of the star Sirius (Ancient Egyptian: spdt or Sopdet, 'Triangle'; Greek:...
terms for either a heliacal or an acronycal rising of a star. However, one concedes that Matthew may have used layman's terms for a rising. Other writers...
appears in the east just prior to sunrise, it is referred to as a heliacalrising. Despite the less favorable lighting conditions for optical astronomy...
Sirius had significance since every 1460 years (the Sothic cycle) its heliacalrising (just before sunrise) marked the Egyptian new year and the inundation...
approaches were invented. The heliacalrising constellation at the vernal equinox is based on the last zodiacal constellation rising above the Eastern Horizon...
together). All the months of the Māori calendar are indicated by this heliacalrising of a particular star on the eastern horizon just before dawn, on the...
passes through SOHO's LASCO C3 every August. For Earth observers, the heliacalrising (pre-sunrise appearance) of Regulus occurs late in the first week of...
indicate that the Egyptians had already established a link between the heliacalrising of Sirius (Ancient Egyptian: Spdt or Sopdet, "Triangle"; Greek: Σῶθις...
missionary James Macdonald wrote that the confusion was settled with heliacalrising of Pleiades, which is associated with the month of uNhlangulana. Umkhosi...
prominence in its constellation, Canis Major (the Greater Dog). The heliacalrising of Sirius marked the flooding of the Nile in Ancient Egypt and the...
sultry days of summer. They were historically the period following the heliacalrising of the star system Sirius (known colloquially as the "Dog Star"), which...
still used by many Zoroastrian communities. A heliacal year is the interval between the heliacalrisings of a star. It differs from the sidereal year for...
have consciously oriented their temples to create alignment with the heliacalrisings of the stars. There is scattered evidence to suggest that the oldest...
vegetation and the annual flooding of the Nile River, as well as the heliacalrising of Orion and Sirius at the start of the new year. He became the sovereign...
for the seasonal year. For example, the ancient Egyptians used the heliacalrising of Sirius to predict the flooding of the Nile. A study of temperature...
a reference to ritual sacrifices performed by ancient Arabs at the heliacalrising of Capricornus. Another star visible to the naked eye is γ Capricorni...
has given it importance in many cultures, ancient and modern. Its heliacalrising, which moves through the seasons over millennia (see precession) was...
over the centuries, the date was drifting in the calendar. The first heliacalrising of Sirius was used for its prediction and this practice, the observation...
heliacalrising of Sirius (Sothis) and divided into the three seasons of akhet (Inundation), peret (Growth) and shemu (Harvest). The heliacalrising of...
came to its end, meaning that for the first time in 1,460 years, the heliacalrising of Sirius coincided with the Egyptian calendar's New Year.: 16 The...
festival came to an end during the full moon which fell closest to the heliacalrising of the star Sirius being visible in Sparta. The festival took place...
calendar, the intercalary month was added as needed to maintain the heliacalrising of Sirius in the fourth month of this season. This meant that the Season...
degree ecliptic into 36 parts of 10 degrees each, both for theurgical and heliacal horological purposes. The decans each appeared, geocentrically, to rise...
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