Calendar Wiki


The International Moon Calendar is not the the same as the International Lunation Calendar (ILC) but a part of the International Week Calendar (IWC), although not part of the International Standard Week Calendar (ISWC). It does not have a standard acronym since IMC already designates the International Month Calendar (with irregular lengths). It can be considered a variant of the International Fixed Calendar (IFC).

A moon in this calendar is exactly 4 weeks long and begins on Monday. The only exception is the last moon of the year which may include the 53rd week, alias leap week, and therefore is 5 weeks long.

Moon layout
Week 1 2 3 4 5 6 7
Mon Tue Wed Thu Fri Sat Sun
W1 01 02 03 04 05 06 07
W2 08 09 10 11 12 13 14
W3 15 16 17 18 19 20 21
W4 22 23 24 25 26 27 28
Week year layout
W01 W02 W03 W04 W05 W06 W07 W08 W09 W10 W11 W12 W13 W14 W15 W16 W17 W18 W19 W20 W21 W22 W23 W24 W25 W26 W27 W28 W29 W30 W31 W32 W33 W34 W35 W36 W37 W38 W39 W40 W41 W42 W43 W44 W45 W46 W47 W48 W49 W50 W51 W52
Q1 Q2 Q3 Q4
Q11 Q12 Q13 Q21 Q22 Q23 Q31 Q32 Q33 Q41 Q42 Q43
M01 M02 M03 M04 M05 M06 M07 M08 M09 M10 M11 M12 M13


Northern-hemisphere, North-American[1] and Celtic moon names
Moon Celtic Zodiac Nature Weather Culture Color
M01 🦌 Stag / Deer Wolf Ice Old ⚪ Gray
M02 🐱 Cat Snow, Storm Hunger ⚪ White
M03 🐍 Snake / Adder Worm, Crow, Crust, Sugar (Thaw, Melt) Lenten, Chaste, Sap 🟢 Lime
M04 🦊 Fox Grass, Fish, Hare, Egg (Breeze) Paschal 🔴 Pink, Magenta, Fuchsia
M05 🐮 Bull / Cow Flower, Milk, Birch (Bloom, Blossom, Joy) 🟢 Green
M06 🐲 Seahorse / (Dragon) Strawberry, Rose Hot, Heat Mead 🟣🔴 Rose, Lilac
M07 🐦 Wren / Bird Buck, Wort Thunder Hay ⚪🔵 Silver, Cyan, Light
M08 🐴 Horse / (Unicorn) Sturgeon, Fruit, Grain 🟡 Gold, Yellow
M09 🐟 Salmon / Fish Corn, Barley Harvest 🟤🟠 Brown, Orange, Olive
M10 🦢 Swan Wine (Windy) (Vintage) 🔵 Blue
M11 🦋 Butterfly Leaf (Foggy) Hunter's, Blood, Sanguine 🔴 Red
M12 🐺 Wolf / Hound Beaver, Oak Frosty Mourning 🟣 Purple
M13 🦅 Hawk / Falcon / (Eagle) Cold Yule ⚫ Black, Dark