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- Heliacal_rising abstract "The heliacal rising (/hɪˈlaɪəkəl/, hi-LY-ə-kəl) of a star (or other body such as the moon, a planet or a constellation) occurs when it first becomes visible above the eastern horizon for a brief moment just before sunrise, after a period of time when it had not been visible.Each day after the heliacal rising, the star will rise slightly earlier and remain visible for longer before the light from the rising sun makes it disappear (the sun appears to drift eastward relative to the stars by about one degree a day along a path called the ecliptic). Over the following days the star will move further and further westward (about one degree per day) over the dome of the pre-dawn sky, until eventually it is no longer visible in the sky at dawn because it has already set below the western horizon. This is called the cosmical setting. The same star will reappear in the eastern sky at dawn approximately one year after its previous heliacal rising. Because the heliacal rising depends on the observation of the object, its exact timing can be dependent on weather conditions.Some stars, when viewed from a particular latitude on Earth, will not have a heliacal rising or setting. These are Circumpolar stars, which are either always in the sky, or never. For example, the North Star is not visible in Australia and the Southern Cross is not seen in Europe, because they always stay below the respective horizons.Constellations containing stars that rise and set were incorporated into early calendars or zodiacs. The ancient Egyptian calendar was based on the heliacal rising of Sirius. The ancient Egyptians devised a method of telling the time at night based on the heliacal risings of 36 stars called decan stars (one for each 10° segment of the 360° circle of the zodiac/calendar). The Sumerians, the Babylonians, and the ancient Greeks also used the heliacal risings of various stars for the timing of agricultural activities.To the Māori of New Zealand, the Pleiades are called Matariki, and their heliacal rising signifies the beginning of the new year (around June). The Mapuche of South America called the Pleiades Ngauponi which in the vicinity of the we tripantu (Mapuche new year) will disappear by the west, lafkenmapu or ngulumapu, appearing at dawn to the East, a few days before the birth of new life in nature. Heliacal rising of Ngauponi, i.e. appearance of the Pleiades by the horizon over an hour before the Sun approximately 12 days before the winter solstice, announced we tripantu. When a planet or satellite (e.g. the Moon) has a heliacal rising, being located on the ecliptic, there is a conjunction with the sun. Depending on the type of conjunction, there may be a syzygy, eclipse, transit, or occultation of the sun. The detailed search for the Moon's heliacal rising (a.k.a. the new moon) often determines the start of a month in a lunar calendar, which may have religious or political significance.The corresponding rising of a celestial body above the eastern horizon at sunset is called its acronychal rising, which if this occurs for a planet, signifies a solar opposition in astrology, another type of syzygy. If the moon has an acronychal rising, it is usually a full moon or potentially a lunar eclipse.".
- Heliacal_rising wikiPageID "153961".
- Heliacal_rising wikiPageRevisionID "598114589".
- Heliacal_rising hasPhotoCollection Heliacal_rising.
- Heliacal_rising subject Category:Observational_astronomy.
- Heliacal_rising subject Category:Technical_factors_of_astrology.
- Heliacal_rising subject Category:Time_in_astronomy.
- Heliacal_rising type Abstraction100002137.
- Heliacal_rising type Beginning107290905.
- Heliacal_rising type Cause107326557.
- Heliacal_rising type Event100029378.
- Heliacal_rising type Factor107327805.
- Heliacal_rising type Happening107283608.
- Heliacal_rising type Origin107323922.
- Heliacal_rising type PsychologicalFeature100023100.
- Heliacal_rising type TechnicalFactorsOfAstrology.
- Heliacal_rising type YagoPermanentlyLocatedEntity.
- Heliacal_rising comment "The heliacal rising (/hɪˈlaɪəkəl/, hi-LY-ə-kəl) of a star (or other body such as the moon, a planet or a constellation) occurs when it first becomes visible above the eastern horizon for a brief moment just before sunrise, after a period of time when it had not been visible.Each day after the heliacal rising, the star will rise slightly earlier and remain visible for longer before the light from the rising sun makes it disappear (the sun appears to drift eastward relative to the stars by about one degree a day along a path called the ecliptic). ".
- Heliacal_rising label "Heliacal rising".
- Heliacal_rising label "Heliakalny wschód".
- Heliacal_rising label "Heliakisch".
- Heliacal_rising label "Levata eliaca".
- Heliacal_rising label "Lever héliaque".
- Heliacal_rising label "Nascer helíaco".
- Heliacal_rising label "Orto helíaco".
- Heliacal_rising label "Гелиакический восход".
- Heliacal_rising label "ヒライアカル・ライジング".
- Heliacal_rising label "偕日升".
- Heliacal_rising sameAs Heliakisch.
- Heliacal_rising sameAs Ηλιακή_ανατολή.
- Heliacal_rising sameAs Orto_helíaco.
- Heliacal_rising sameAs Lever_héliaque.
- Heliacal_rising sameAs Levata_eliaca.
- Heliacal_rising sameAs ヒライアカル・ライジング.
- Heliacal_rising sameAs 신출.
- Heliacal_rising sameAs Heliakalny_wschód.
- Heliacal_rising sameAs Nascer_helíaco.
- Heliacal_rising sameAs m.0143b7.
- Heliacal_rising sameAs Q368373.
- Heliacal_rising sameAs Q368373.
- Heliacal_rising sameAs Heliacal_rising.
- Heliacal_rising wasDerivedFrom Heliacal_rising?oldid=598114589.
- Heliacal_rising isPrimaryTopicOf Heliacal_rising.