Calendar conventions and sources — reviewed 8 September 2026

CHINESE
Civil lunisolar New Year, not Li Chun / BaZi. Birth dates 1901–2100.
Hong Kong Observatory: Gregorian-Lunar conversion tables (200 annual tables).
https://www.hko.gov.hk/en/gts/time/conversion1_text.htm
https://www.hko.gov.hk/en/gts/time/calendar/text/files/T2026e.txt
Convention explanation:
https://www.weather.gov.hk/en/education/astronomy-and-time/time-service/00506-what-year-is-it-today.html
Only the first day of lunar month 1 is retained from each annual table. Civil dates are compared as entered; no birth-time conversion is inferred.

JAPANESE
Annual eto, 12 animals, five elements and polarity; modern civil year from January 1. Birth years 1900–2100, up to the current year.
National Diet Library, calendar reform in 1873:
https://www.ndl.go.jp/koyomi/chapter1/s2.html
National Diet Library, contemporary diary on introduction of the Gregorian calendar:
https://www.ndl.go.jp/nikki/citeid/shishido_18721202/
This tool does not implement Nine Star Ki, Setsubun-based fortune-telling or the pre-1873 Japanese calendar.

TIBETAN
Annual animal, element and Mewa, with Losar in the Phugpa tradition. Birth dates 1900–2100. Civil Gregorian dates compared to the published/calculated date of Losar; no birth-hour adjustment at dawn. Not a complete Tibetan astrological chart.
Svante Janson, Tibetan calendar mathematics, arXiv:1401.6285 (2014):
https://arxiv.org/abs/1401.6285
https://arxiv.org/pdf/1401.6285
Losar table generated independently using exact rational arithmetic, E1987, equations 5.10 and 7.1–7.22 (standard a2 = 1/28). Section 8: first civil day is 1 + floor(true date of day 30, regular month 12 of preceding year), including years whose first month is a leap month. All 120 dates in Table 1 (1927–2046) match. Other traditions, and some calculation variants, can differ.
Khyentse Foundation, observed Losar on February 28, 2025:
https://khyentsefoundation.org/story/losar-tashi-delek/
Michael Erlewine, Tibetan astrology, birth Mewa (1941 = 5):
https://astrologysoftware.com/m/community/learn/articles/article_161.html
Annual Mewa descends 1–9: 1941 = 5, 2024 = 3, 2025 = 2, 2026 = 1. This is the birth-year Mewa, not the separate age-dependent descending-Mewa calculation.

MAYA
Tzolk'in day = number 1–13 + one of 20 names, 260-day cycle. GMT 584283 correlation; proleptic Gregorian input, 1900–2100. No Dreamspell or birth-hour boundary inferred.
Smithsonian National Museum of the American Indian, Living Maya Time:
https://maya.nmai.si.edu/es/calendario/el-sistema-calendario
https://maya.nmai.si.edu/calendar/calendar-system
Reference dates: 2000-01-01 = 11 Ik'; 2012-12-21 = 4 Ajaw.
FAMSI, John Montgomery, Dictionary of Maya Hieroglyphs, ordered day names:
https://research.famsi.org/montgomery_dictionary/daysigns.php
FAMSI, calendar explanation:
https://research.famsi.org/research/calendrics/index.html
Day names are Yucatec forms; spellings vary across publications. Personality/affinity descriptions and illustrative emoji are this site's modern symbolic adaptation, not translated ancient predictions or authentic glyphs.

EGYPTIAN
Modern symbolic variant retained from these sites. Fixed inclusive Gregorian month-day intervals, including February 29. Not a reconstruction of an ancient birthday horoscope or the Dendera zodiac.
Thoth: Dec 21–Jan 19; Isis: Jan 20–Feb 18; Osiris: Feb 19–Mar 20;
Horus: Mar 21–Apr 19; Set: Apr 20–May 20; Anubis: May 21–Jun 20;
Bastet: Jun 21–Jul 22; Sekhmet: Jul 23–Aug 22; Nephthys: Aug 23–Sep 22;
Geb: Sep 23–Oct 22; Nut: Oct 23–Nov 21; Amun: Nov 22–Dec 20.
Historical context, Rosicrucian Egyptian Museum, Dendera zodiac:
https://egyptianmuseum.org/explore/greco-and-roman-period-monuments-dendera-zodiac
The museum source describes the historical object, not the modern deity/date mapping above.

The five tools use local calculations and saved interpretations. No AI call is required. Personality, affinity and luck readings are symbolic; calendar arithmetic does not validate predictions.

Editorial revision 2026-09-10
The animal, element, polarity, Mewa, Maya and Egyptian interpretation paragraphs are contemporary editorial reflection prompts. They are not translations of historical personality predictions. Calendar algorithms, boundaries, glyphs, names and correspondences remain unchanged. Maya and Egyptian results now present a practical example and reflection question in the existing four text fields.
Additional accessible primary references checked for this revision:
https://research.famsi.org/date_mayaLC.php (calendar conversion; default correlation 584283)
https://research.famsi.org/montgomery_dictionary/daysigns.php (twenty ordered day names)
https://www.ndl.go.jp/koyomi/chapter1/s2.html (Japanese calendar adoption in 1873)
https://arxiv.org/abs/1401.6285 (Janson, Tibetan Calendar Mathematics)
https://egyptianmuseum.org/explore/greco-and-roman-period-monuments-dendera-zodiac (historical object; does not establish the modern deity/date mapping)