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Navajo ancient Lunar calendar begin on each New Moon to the day before the New Moon, new Month begin on the New Moon, when the evening come the Moon ei yiitsoodoołeeł akoh Diyįn at’ee doo jiní

Astronomical Seasons

Northern Hemisphere Spring: 21 March to 20 June
Summer: 21 June to 20 September
Autumn:  21 September to 20 December
Winter:    21 December to 20 March

Southern Hemisphere Spring: 21 September to 20 December
Summer: 21 December to 20 March

Autumn:  21 March to 20 June
Winter:    21 June to 20 September

Native American Astronomy

By Dr. Anthony F. Aveni on Native Astronomy & Archaeoastronmy

Astronomy of Many Cultures

Science Center - Dr. A. F. Aveni

Archaeoastronomy in Americas

Dr. A. F. Aveni, Astronomy Teacher

The First Quarter

1.  Ghąąjį’  Aak’eed - Shį doo hei ałheedini’ah Autumn Equinoctial September 21 the dividing of the seasons is known as Ghąąjį’ and why our ancestors named Ghąąjį’ is that cosmic is Yadiłhił Hastiin  its a cosmic blood darkness man standing IINÁ and we are going up his back BEGINNING EQUINOX dei goh Biighąan godei jį’ ei shįįh oołye Biighąąjį’ goh yiikah Ghąąjį’, aak’eed goh dei this is a prototype Diné view of cosmos

Bijei Its a human so it must have a heart Niłch’i ts’osi Little Cold Breeze and Naałaashiih (Tarantula) is its feather Be’ets’os, other calendars like Mayan have images 3 or more in one symbol and this Navajo calendar is a human in standing position (head - Astro iinǫǫłąh), has a heart and a feather, Harvest time, ceremonies times, learning the Tł’eeji hataałi time

Aak’eed (Da’ihik’eedoołeeł dą’nees t’ąǫ tádidį́į́n yee’ ałhaanaałdeeh doołeeł jini naana biketł’ooł do’) Navajo knows that all life reproduces so some of Diné like Ch’osh, Tł’iish, Shash, Naałaashiih, Dlǫ́ǫ́’, as well as some plants life, they  too go into hibernation for the winter have reproduces in the darkness they fornicate have sex by roots, and they emerges in the spring time DĄĄN dit’odi or tender and also Dąąn means a lose tender plants for food eaten emerged life and their Chąą’ are lose creamy is called Dąą’ dąąn

Ye’iiih yi’aash doołeeł on the last week of September around Fall New Moon the Northern Fair begin the Mountains will be cover with clouds call iinǫǫł ąh Astro the male mask symbolized with Diłyéhé Pleiades will appear in the eastern horizon  See T’ééji Hataałi

Hane’ biłhas ąh k’ad Diyįn Diné’e ła’anaałdee’ bikeyah goyaah, aadishįįh ałhaanaałdeeh, naana Diné doo Saaniih do’ t’aah akoh at’e hei goh ałhaanaałdeeh hoghąn gone’

The Asdzaní Nadleeh is born on fall equiox because it associates with ak’eed aak’eed when the Father Creator cosmos meets the Earth the K’ǫs is sign of Creator Áhí́ (fog) thats when she is conceieved and born in the spring equinox is logical cycles of life

Hastiin Sik’i’i (Orion) appears and men prepares to go hunting the Bįįh (Deer) before they start mating, Tseta Dibé (Big horns), Tązhii do’ (wild Turkey), Dahsani (Porcupine), and ripen wild yucca fruits, other berries and more in the winter story telling incudes Coyote Hane’   Tązhii

2.   Niłch’its’osi is the 2nd month ’Little cold wind breezes’, going toward the winter colder days, its a human again that has its Bijei ei (Heart) Niłch’itsoh Big cold Breezes wind, the Hunting begin the New Moon month of Niłch’its’osi (Solar month would be November western calendar), Hastiin sik’i’i rise further up with his bow and arrows in shooting position The Hunter Orion is Niłch’its’osi be’ets’os its Feather and this hunter is almost universal, pinion gathering time, continue harvest some farm produces like pumpkins with hardened skin, big cold is coming and hibernation times with Keshjee’ playing with numbers 102, Na’atł’oh string creativity and Coyote’s knowledge sharing and other reation stories,

3.   Niłch’itsoh is the 3rd Month and bijei ei Niłch’itsoh and Atse etsoh ei be’ets’os, cold increased and hibernate to learn play késhjee’ and others stories telling, attend ceremonies, Kinaałda is continuous year round, Atse ets’os ei the constellation Scorpion as its First feather up in the Hei iiłnįį’ winter solstice, but sometimes known as Ałtsee dąą’ ałts’ooz yęęh or previous ’slender one’, indoor during cold month is making clothes from earlier tanned skins, coating digging sticks, making scandal from old yucca both narrow and wide baccata bayonet, yucca were also make ropes, thawing ice begin, Rabbit skins are made blankets, coats, socks, interesting,
buckskins is oldest materials known in Navajo traditional to make clothes, deer as food and skins use in all like bags, mocassin, clothes, medicine bags and medicine in Nightway and other ceremonies, its colder during Hei iiłnii’goh meaning during winter solstice  its

"Aztec Calendar.The Aztec calendar was an adaptation of the Mayan calendar. It consisted of a 365-day agricultural calendar, as well as a 260-day sacred calendar."

2nd Quarter

4.   Yesniłt’ees
5.   Atsabiyáásh

7.   T’ąąchił
8.   T’ąątsoh
9.   Ya’iishjaachiłi

10. Ya’iishjaatsoh
11.  Bii’int’ąats’osi
12.  Bii’int’ąątsoh