Mōnaþ

Se mōnaþ is ānhād oþþe stycce tīman, gebrȳced mid gerīmbōcum, þe is ābūtan swā lang swā sum gebyrde fæc gelenge þǣm færelde þæs mōnan (þ.i. "mōna-þ").

 mōnaþlengþa 

sidereal mōnaþ:27.321661547 + 0.000000001857*y days
tropical mōnaþ:27.321582241 + 0.000000001506*y days
anomalistic mōnaþ:27.554549878 − 0.000000010390*y days
draconic mōnaþ:27.212220817 + 0.000000003833*y days
synodic mōnaþ:29.530588853 + 0.000000002162*y days

 Mōnþas in the Julian and Gregorian calendars 

Sēo Gregorisce gerīmbōc, swā sēo Iulanisce gerīmbōc ǣr hire, hæfþ twelf mōnþas:

 Se æfterra Gēola, mid 31 dagum;
 Solmōnaþ, mid 28 dagum oþþe 29 in bises;
 Hrēþmōnaþ, mid 31 dagum;
 Ēastermōnaþ, mid 30 dagum;
 Þrimilcemōnaþ, mid 31 dagum;
 Sēremōnaþ, mid 30 dagum;
 Mǣdmōnaþ, mid 31 dagum;
 Wēodmōnaþ, mid 31 dagum;
 Hāligmōnaþ, mid 30 dagum;
 Winterfylleþ, mid 31 dagum;
 Blōtmōnaþ, mid 30 dagum;
 Gēolmōnaþ, mid 31 dagum.

Þrēotig dagas hæfþ Hāligmōnaþ,
Ēastermōnaþ, Sēremōnaþ, and Blōtmōnaþ;
Ælc þǣre lāf hæfþ ān and þrēotig,
Būton āne Solmōnaþ,
Sēo hæfþ eahta and tweontig gemænelīce,
Oððæt bisses wyrht hit nigon and tweontig.

oþðe to endenne:

Sēo hæfþ eahta and tweontig gemænelīce,
And nigon and tweontig in ælcum bises.

 See also 
 Table of lunar month correspondences

Flocc:Gerīmbōc