March has 31 days. The moon has 30.

Golden NumberA 19-year cycle used to determine the lunar phase for calculating Easter.	Dominical LetterA repeating A–G sequence used to identify Sundays throughout the year.	Roman Day	Feasts and Calculations
III	d	Kalends	Albinus, Bishop, and Saint David. Incline original: "Incl"; likely a reference to the 'Inclinatio Epactarum', a lunar calculation. Saint David is the patron saint of Wales.
	e	6th [before the] Nones	Saint Chad, Bishop. Change of the Concurrents original: "muta con"; referring to the 'Concurrents', numbers used to synchronize the solar cycle with the days of the week.
XI	f	5th [before the] Nones
	g	4th [before the] Nones
XIX	A	3rd [before the] Nones
VIII	B	2nd [before the] Nones
	C	NONES	Perpetua and Felicity, Virgins. Early Christian martyrs from Carthage, d. 203 AD.
XVI	d	8th [before the] Ides	Easter Limit original: "Termin. rnn l' pascha"; the earliest possible date for the 'Paschal Term' or the full moon used to calculate Easter.
V	e	7th [before the] Ides
	f	6th [before the] Ides	Keys of Easter original: "Claues pasche"; mathematical markers used to find the date of Easter Sunday.
XIII	g	5th [before the] Ides
II	A	4th [before the] Ides	Gregory, Pope. Pope Gregory the Great, who sent the mission to convert the Anglo-Saxons.
	B	3rd [before the] Ides
X	C	2nd [before the] Ides
	d	IDES
XVIII	e	17th [before the] Calends	APRIL
VII	f	16th [before the] Calends
	g	15th [before the] Calends
XV	A	14th [before the] Calends
IV	B	13th [before the] Calends	Cuthbert and Wulfram, Bishops. Cuthbert was a beloved Northumbrian saint; Wulfram was a missionary bishop to the Frisians.
	C	12th [before the] Calends	Saint Benedict, Abbot. The father of Western monasticism and author of the Rule of Saint Benedict.
XII	d	11th [before the] Calends
I	e	10th [before the] Calends
	f	9th [before the] Calends
IX	g	8th [before the] Calends	The Annunciation of the Lord. Commemorating the Angel Gabriel’s visit to the Virgin Mary.
	A	7th [before the] Calends
XVII	B	6th [before the] Calends	The first Resurrection. The traditional historical date assigned to the Resurrection of Christ, distinct from the moveable feast of Easter.
VI	C	5th [before the] Calends
	d	4th [before the] Calends
XIV	e	3rd [before the] Calends
III	f	2nd [before the] Calends

The night has 12 hours and the day likewise.

Referring to the Spring Equinox, where day and night are of equal length.