Maya day · Tzolkʼin
Mayan Library ↗05 · Science Library
Time, numbers and the sky.
Calendars of the world, numeral systems, astronomy, the Solar System and the universe.
- 01The three days
- 02Today in every count
- 03The Earth right now
- 04Solar System
- 05Numerals of the World
- 06Words of science
Sources in every card · References
01The three days
One day, three ways to tell it.
The Maya Tzolkʼin and the Mexica Tonalpohualli count 260 days with 13 numbers and 20 signs; the NEO day follows the Earth on its orbit and the Moon in its phase. Choose any day.
Mexica day · Tonalpohualli
Mexican Library ↗…
The twenty Mexica day-signsNEO day · the sky of the day
13 counts ↗…
The same day in 13 counts02Today in every count
The same day in thirteen counts of humanity.
Unicode CLDR calendars and the Maya and Mexica counts with the GMT correlation (584283), computed in your browser. Nothing is sent anywhere. The day chosen above changes them all.
- Gregorian…Solar · the civil calendar of the world
- Hijri…Lunar · Islamic calendar
- Hebrew…Lunisolar · Jewish calendar
- Chinese…Lunisolar · year of the cycle of sixty
- Persian…Solar · Solar Hijri, Iran and Afghanistan
- Indian national…Solar · Saka era
- Ethiopian…Solar · thirteen months
- Buddhist…Solar · Buddhist era, Thailand
- Japanese…Era names · Reiwa
- Maya Long Count…Days since the creation, 13.0.0.0.0
- Maya Tzolkʼin · Haabʼ…260 days · 365 days
- Mexica Tonalpohualli…260 days: 13 numbers × 20 signs
- The Moon…Phase of the day
03The Earth right now
Where the Sun shines, this minute.
The point where the Sun stands overhead and the line between day and night, from the position of the Sun computed in your browser and redrawn every minute.
04Solar System
One star, eight planets, one home.
The bodies of our sky, with the symbols that astronomy has used for centuries.
Sun
Our star
A 4.6-billion-year-old star holding 99.8% of the Solar System's mass.
Mercury
The swift messenger
The closest planet to the Sun; a year of 88 days.
Venus
The morning and evening star
The hottest planet, wrapped in clouds; Mesoamerica tracked its 584-day cycle.
Earth
Our home
The only world known to hold life; one ocean, one atmosphere, one bioregion.
Moon
Earth's companion
Its 29.5-day cycle gave many peoples their months.
Mars
The red planet
Iron-red deserts and the tallest volcano in the Solar System.
Jupiter
The giant
The largest planet; its storm, the Great Red Spot, is larger than Earth.
Saturn
The ringed planet
Rings of ice and rock; a year of 29.5 Earth years.
Uranus
The tilted giant
An ice giant spinning on its side.
Neptune
The far blue world
The farthest planet, found by mathematics in 1846.
05Numerals of the World
Ten ways to write a number.
Base 10, base 20, base 60: how humanity learned to count, from Babylon to the Maya. The Maya numbers 0–19 →
Hindu-Arabic
Base 10 · India → the world
Born in India with zero, carried by Arab scholars; today the numerals of the world.
Roman
Letters as numbers
I V X L C D M: 2026 is MMXXVI.
Maya
Dots and bars
A shell for zero, dots of one, bars of five — counted in twenties. Three bars: fifteen.
Babylonian
Wedges of clay
Wedges for one (▼) and ten (◀); our 60 minutes and 360 degrees come from Mesopotamia.
Chinese
Characters
Written with characters; counting rods anticipated place value.
Devanagari
Numerals of India
The family from which the world's digits descend.
Egyptian
Hieroglyphs
Strokes for 1, heel bones (∩) for 10, coils of rope for 100: ∩|| is twelve.
Greek
Letters as numbers
Each letter also a number: α = 1, β = 2, γ = 3.
Arabic-Indic
Eastern Arabic
Used today across much of the Arab world.
Ge'ez
Ethiopic
The numerals of the Ethiopian script.
06Words of science
The terms of the library.
Every concept is a term, connected, in every language, with its sources.
- Calendar
- A count of time tied to the Sun, the Moon, the stars or sacred numbers.
- Numeral system
- A way of writing numbers: base 10, base 20 (Maya), base 60 (Babylon).
- Tzolk'in
- The sacred count of 260 days: 20 day-signs combined with 13 numbers.
- Tonalpohualli
- The count of days: 260 days made of 20 day-signs and 13 numbers.
- Long Count
- A count of days in a modified base 20 (a tun of 18 × 20 days) from the era date 13.0.0.0.0, 11 August 3114 BCE, used for historical dates.
- NEOLEDGE
- The knowledge NEO shares, generates, organizes and spreads: every concept a term, connected, in every language, with its sources.