Sirius (bottom) and Orion (right). The Winter Triangle is formed from the three brightest stars in the northern winter sky: Sirius, Betelgeuse (top right), and Procyon (top left).Sirius as the brightest star in the constellation Canis Major as observed from the Earth (lines added for clarity).
The Sothic cycle or Canicular period is a period of 1,461 Egyptian civil years of 365 days each or 1,460 Julian years averaging 365+1⁄4 days each. During a Sothic cycle, the 365-day year loses enough time that the start of its year once again coincides with the heliacal rising of the star Sirius (Ancient Egyptian: spdt or Sopdet, 'Triangle'; Greek: Σῶθις, Sō̂this) on 19 July in the Julian calendar.[1][a] It is an important aspect of Egyptology, particularly with regard to reconstructions of the Egyptian calendar and its history. Astronomical records of this displacement may have been responsible for the later establishment of the more accurate Julian and Alexandrian calendars.
^"Ancient Egyptian Civil Calendar", La Via, retrieved 8 February 2017.
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The Sothiccycle or Canicular period is a period of 1,461 Egyptian civil years of 365 days each or 1,460 Julian years averaging 365+1⁄4 days each. During...
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recorded date during the reign of Senusret III can be correlated to the Sothiccycle, consequently, many events during this dynasty frequently can be assigned...
intercalary, embolismic, or leap month. Their months are based on the regular cycle of the Moon's phases. So lunisolar calendars are lunar calendars with –...
461 calendar years (see Sothiccycle). Thus, the Armenian year 1461 (Gregorian & Julian 2011) completed the first Sothiccycle, and the Armenian Calendar...
years, it began to slowly cycle backwards through the solar year. Sirius itself, about 40° below the ecliptic, follows a Sothic year almost exactly matching...
and months) are usually, though not necessarily, synchronized with the cycle of the sun or the moon. The most common type of pre-modern calendar was...
astronomical records of this displacement led to the discovery of the Sothiccycle and, later, the establishment of the more accurate Julian and Alexandrian...
syncretized with Isis and Demeter. Ikhemu-sek Astrotheology Book of Sothis Sothiccycle Variant spellings of Sopdet include , , , , , , and in late Egyptian:...
era Seleucid era Era of Caesar (Iberia) Before present Hijri Egyptian Sothiccycle Hindu units of time (Yuga) Mesoamerican Long Count Short Count Tzolk'in...
Gould's Time's Arrow, Time's Cycle (1987) also deals in large part with the evolution of the concept. In Time's Arrow, Time's Cycle, Gould cited one of the...
with lunar month, solar year Metonic cycle – 19-year pattern in lunisolar calendars Saros (astronomy) – Cycles used to predict eclipses of the Sun and...
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In 139, at the start of the reign of Antoninus Pius (r. 138–161), the Sothiccycle came to its end, meaning that for the first time in 1,460 years, the...
calendar, whose months correspond to cycles of Moon phases. The months of the Gregorian calendar do not correspond to cycles of the Moon phase. The Egyptians...
based on the monthly cycles of the Moon's phases (synodic months, lunations), in contrast to solar calendars, whose annual cycles are based on the solar...
era Seleucid era Era of Caesar (Iberia) Before present Hijri Egyptian Sothiccycle Hindu units of time (Yuga) Mesoamerican Long Count Short Count Tzolk'in...
era Seleucid era Era of Caesar (Iberia) Before present Hijri Egyptian Sothiccycle Hindu units of time (Yuga) Mesoamerican Long Count Short Count Tzolk'in...
era Seleucid era Era of Caesar (Iberia) Before present Hijri Egyptian Sothiccycle Hindu units of time (Yuga) Mesoamerican Long Count Short Count Tzolk'in...
era Seleucid era Era of Caesar (Iberia) Before present Hijri Egyptian Sothiccycle Hindu units of time (Yuga) Mesoamerican Long Count Short Count Tzolk'in...
era Seleucid era Era of Caesar (Iberia) Before present Hijri Egyptian Sothiccycle Hindu units of time (Yuga) Mesoamerican Long Count Short Count Tzolk'in...
era Seleucid era Era of Caesar (Iberia) Before present Hijri Egyptian Sothiccycle Hindu units of time (Yuga) Mesoamerican Long Count Short Count Tzolk'in...
the same point in the calendar every 1,460 years (a period called the Sothiccycle). Umma calendar lunisolar Mesopotamian Bronze Age Sumer/Mesopotamia Recorded...
era Seleucid era Era of Caesar (Iberia) Before present Hijri Egyptian Sothiccycle Hindu units of time (Yuga) Mesoamerican Long Count Short Count Tzolk'in...
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