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The Natural Compass
13-month date and Gregorian calendar
  • 13-month (IFC) April 28, 2026
  • Gregorian Wednesday, 22 April 2026
Astronomical rhythm (UTC) — lunar quarters, solstices, cross-quarters

These instants are the same everywhere; only local labels change with time zone.

Major lunar phases

Synodic model: fixed month 29.53058867 days from new moon 2000-01-06 18:14 UTC; quarters at 0, ¼, ½, and ¾ of that month (lunation containing your selected date; same anchor as the moon card above).

  • New Moon
  • First quarter
  • Full Moon
  • Last quarter

Solstices and equinoxes · 2026

Jean Meeus, Astronomical Algorithms (2nd ed.), chapter 27; shown in UTC, rounded to the nearest minute.

  • March equinox
  • June solstice
  • September equinox
  • December solstice

Cross-quarters (astronomical midpoints)

Each time is the midpoint in time between the two surrounding equinox or solstice instants for 2026 (winter uses December solstice and the following March equinox). This is not the fixed “15° mid-sign” rule and not civil calendar quarter-days.

  • Spring cross-quarter (March equinox → June solstice)
  • Summer cross-quarter (June solstice → September equinox)
  • Autumn cross-quarter (September equinox → December solstice)
  • Winter cross-quarter (December solstice → March equinox (next year))

13-Month Date

Wednesday, 22 April 2026

April 28, 2026

Anchor date: 2026-04-22

Reset to today

Calendar view - 2026

Start with one month, then open the full year when you need it.

Year Day

Thursday, 31 December 2026

April (focus month)

1 Thu 26 Mar
2 Fri 27 Mar
3 Sat 28 Mar
4 Sun 29 Mar
5 Mon 30 Mar
6 Tue 31 Mar
7 Wed 1 Apr
8 Thu 2 Apr
9 Fri 3 Apr
10 Sat 4 Apr
11 Sun 5 Apr
12 Mon 6 Apr
13 Tue 7 Apr
14 Wed 8 Apr
15 Thu 9 Apr
16 Fri 10 Apr
17 Sat 11 Apr
18 Sun 12 Apr
19 Mon 13 Apr
20 Tue 14 Apr
21 Wed 15 Apr
22 Thu 16 Apr
23 Fri 17 Apr
24 Sat 18 Apr
25 Sun 19 Apr
26 Mon 20 Apr
27 Tue 21 Apr
28 Wed 22 Apr
Full 13-month year map
Jump to highlighted day Quick month links: January February March April May June Sol July August September October November December

January

1 Thu 1 Jan
2 Fri 2 Jan
3 Sat 3 Jan
4 Sun 4 Jan
5 Mon 5 Jan
6 Tue 6 Jan
7 Wed 7 Jan
8 Thu 8 Jan
9 Fri 9 Jan
10 Sat 10 Jan
11 Sun 11 Jan
12 Mon 12 Jan
13 Tue 13 Jan
14 Wed 14 Jan
15 Thu 15 Jan
16 Fri 16 Jan
17 Sat 17 Jan
18 Sun 18 Jan
19 Mon 19 Jan
20 Tue 20 Jan
21 Wed 21 Jan
22 Thu 22 Jan
23 Fri 23 Jan
24 Sat 24 Jan
25 Sun 25 Jan
26 Mon 26 Jan
27 Tue 27 Jan
28 Wed 28 Jan

February

1 Thu 29 Jan
2 Fri 30 Jan
3 Sat 31 Jan
4 Sun 1 Feb
5 Mon 2 Feb
6 Tue 3 Feb
7 Wed 4 Feb
8 Thu 5 Feb
9 Fri 6 Feb
10 Sat 7 Feb
11 Sun 8 Feb
12 Mon 9 Feb
13 Tue 10 Feb
14 Wed 11 Feb
15 Thu 12 Feb
16 Fri 13 Feb
17 Sat 14 Feb
18 Sun 15 Feb
19 Mon 16 Feb
20 Tue 17 Feb
21 Wed 18 Feb
22 Thu 19 Feb
23 Fri 20 Feb
24 Sat 21 Feb
25 Sun 22 Feb
26 Mon 23 Feb
27 Tue 24 Feb
28 Wed 25 Feb

March

1 Thu 26 Feb
2 Fri 27 Feb
3 Sat 28 Feb
4 Sun 1 Mar
5 Mon 2 Mar
6 Tue 3 Mar
7 Wed 4 Mar
8 Thu 5 Mar
9 Fri 6 Mar
10 Sat 7 Mar
11 Sun 8 Mar
12 Mon 9 Mar
13 Tue 10 Mar
14 Wed 11 Mar
15 Thu 12 Mar
16 Fri 13 Mar
17 Sat 14 Mar
18 Sun 15 Mar
19 Mon 16 Mar
20 Tue 17 Mar
21 Wed 18 Mar
22 Thu 19 Mar
23 Fri 20 Mar
24 Sat 21 Mar
25 Sun 22 Mar
26 Mon 23 Mar
27 Tue 24 Mar
28 Wed 25 Mar

April

1 Thu 26 Mar
2 Fri 27 Mar
3 Sat 28 Mar
4 Sun 29 Mar
5 Mon 30 Mar
6 Tue 31 Mar
7 Wed 1 Apr
8 Thu 2 Apr
9 Fri 3 Apr
10 Sat 4 Apr
11 Sun 5 Apr
12 Mon 6 Apr
13 Tue 7 Apr
14 Wed 8 Apr
15 Thu 9 Apr
16 Fri 10 Apr
17 Sat 11 Apr
18 Sun 12 Apr
19 Mon 13 Apr
20 Tue 14 Apr
21 Wed 15 Apr
22 Thu 16 Apr
23 Fri 17 Apr
24 Sat 18 Apr
25 Sun 19 Apr
26 Mon 20 Apr
27 Tue 21 Apr
28 Wed 22 Apr

May

1 Thu 23 Apr
2 Fri 24 Apr
3 Sat 25 Apr
4 Sun 26 Apr
5 Mon 27 Apr
6 Tue 28 Apr
7 Wed 29 Apr
8 Thu 30 Apr
9 Fri 1 May
10 Sat 2 May
11 Sun 3 May
12 Mon 4 May
13 Tue 5 May
14 Wed 6 May
15 Thu 7 May
16 Fri 8 May
17 Sat 9 May
18 Sun 10 May
19 Mon 11 May
20 Tue 12 May
21 Wed 13 May
22 Thu 14 May
23 Fri 15 May
24 Sat 16 May
25 Sun 17 May
26 Mon 18 May
27 Tue 19 May
28 Wed 20 May

June

1 Thu 21 May
2 Fri 22 May
3 Sat 23 May
4 Sun 24 May
5 Mon 25 May
6 Tue 26 May
7 Wed 27 May
8 Thu 28 May
9 Fri 29 May
10 Sat 30 May
11 Sun 31 May
12 Mon 1 Jun
13 Tue 2 Jun
14 Wed 3 Jun
15 Thu 4 Jun
16 Fri 5 Jun
17 Sat 6 Jun
18 Sun 7 Jun
19 Mon 8 Jun
20 Tue 9 Jun
21 Wed 10 Jun
22 Thu 11 Jun
23 Fri 12 Jun
24 Sat 13 Jun
25 Sun 14 Jun
26 Mon 15 Jun
27 Tue 16 Jun
28 Wed 17 Jun

Sol

1 Thu 18 Jun
2 Fri 19 Jun
3 Sat 20 Jun
4 Sun 21 Jun
5 Mon 22 Jun
6 Tue 23 Jun
7 Wed 24 Jun
8 Thu 25 Jun
9 Fri 26 Jun
10 Sat 27 Jun
11 Sun 28 Jun
12 Mon 29 Jun
13 Tue 30 Jun
14 Wed 1 Jul
15 Thu 2 Jul
16 Fri 3 Jul
17 Sat 4 Jul
18 Sun 5 Jul
19 Mon 6 Jul
20 Tue 7 Jul
21 Wed 8 Jul
22 Thu 9 Jul
23 Fri 10 Jul
24 Sat 11 Jul
25 Sun 12 Jul
26 Mon 13 Jul
27 Tue 14 Jul
28 Wed 15 Jul

July

1 Thu 16 Jul
2 Fri 17 Jul
3 Sat 18 Jul
4 Sun 19 Jul
5 Mon 20 Jul
6 Tue 21 Jul
7 Wed 22 Jul
8 Thu 23 Jul
9 Fri 24 Jul
10 Sat 25 Jul
11 Sun 26 Jul
12 Mon 27 Jul
13 Tue 28 Jul
14 Wed 29 Jul
15 Thu 30 Jul
16 Fri 31 Jul
17 Sat 1 Aug
18 Sun 2 Aug
19 Mon 3 Aug
20 Tue 4 Aug
21 Wed 5 Aug
22 Thu 6 Aug
23 Fri 7 Aug
24 Sat 8 Aug
25 Sun 9 Aug
26 Mon 10 Aug
27 Tue 11 Aug
28 Wed 12 Aug

August

1 Thu 13 Aug
2 Fri 14 Aug
3 Sat 15 Aug
4 Sun 16 Aug
5 Mon 17 Aug
6 Tue 18 Aug
7 Wed 19 Aug
8 Thu 20 Aug
9 Fri 21 Aug
10 Sat 22 Aug
11 Sun 23 Aug
12 Mon 24 Aug
13 Tue 25 Aug
14 Wed 26 Aug
15 Thu 27 Aug
16 Fri 28 Aug
17 Sat 29 Aug
18 Sun 30 Aug
19 Mon 31 Aug
20 Tue 1 Sep
21 Wed 2 Sep
22 Thu 3 Sep
23 Fri 4 Sep
24 Sat 5 Sep
25 Sun 6 Sep
26 Mon 7 Sep
27 Tue 8 Sep
28 Wed 9 Sep

September

1 Thu 10 Sep
2 Fri 11 Sep
3 Sat 12 Sep
4 Sun 13 Sep
5 Mon 14 Sep
6 Tue 15 Sep
7 Wed 16 Sep
8 Thu 17 Sep
9 Fri 18 Sep
10 Sat 19 Sep
11 Sun 20 Sep
12 Mon 21 Sep
13 Tue 22 Sep
14 Wed 23 Sep
15 Thu 24 Sep
16 Fri 25 Sep
17 Sat 26 Sep
18 Sun 27 Sep
19 Mon 28 Sep
20 Tue 29 Sep
21 Wed 30 Sep
22 Thu 1 Oct
23 Fri 2 Oct
24 Sat 3 Oct
25 Sun 4 Oct
26 Mon 5 Oct
27 Tue 6 Oct
28 Wed 7 Oct

October

1 Thu 8 Oct
2 Fri 9 Oct
3 Sat 10 Oct
4 Sun 11 Oct
5 Mon 12 Oct
6 Tue 13 Oct
7 Wed 14 Oct
8 Thu 15 Oct
9 Fri 16 Oct
10 Sat 17 Oct
11 Sun 18 Oct
12 Mon 19 Oct
13 Tue 20 Oct
14 Wed 21 Oct
15 Thu 22 Oct
16 Fri 23 Oct
17 Sat 24 Oct
18 Sun 25 Oct
19 Mon 26 Oct
20 Tue 27 Oct
21 Wed 28 Oct
22 Thu 29 Oct
23 Fri 30 Oct
24 Sat 31 Oct
25 Sun 1 Nov
26 Mon 2 Nov
27 Tue 3 Nov
28 Wed 4 Nov

November

1 Thu 5 Nov
2 Fri 6 Nov
3 Sat 7 Nov
4 Sun 8 Nov
5 Mon 9 Nov
6 Tue 10 Nov
7 Wed 11 Nov
8 Thu 12 Nov
9 Fri 13 Nov
10 Sat 14 Nov
11 Sun 15 Nov
12 Mon 16 Nov
13 Tue 17 Nov
14 Wed 18 Nov
15 Thu 19 Nov
16 Fri 20 Nov
17 Sat 21 Nov
18 Sun 22 Nov
19 Mon 23 Nov
20 Tue 24 Nov
21 Wed 25 Nov
22 Thu 26 Nov
23 Fri 27 Nov
24 Sat 28 Nov
25 Sun 29 Nov
26 Mon 30 Nov
27 Tue 1 Dec
28 Wed 2 Dec

December

1 Thu 3 Dec
2 Fri 4 Dec
3 Sat 5 Dec
4 Sun 6 Dec
5 Mon 7 Dec
6 Tue 8 Dec
7 Wed 9 Dec
8 Thu 10 Dec
9 Fri 11 Dec
10 Sat 12 Dec
11 Sun 13 Dec
12 Mon 14 Dec
13 Tue 15 Dec
14 Wed 16 Dec
15 Thu 17 Dec
16 Fri 18 Dec
17 Sat 19 Dec
18 Sun 20 Dec
19 Mon 21 Dec
20 Tue 22 Dec
21 Wed 23 Dec
22 Thu 24 Dec
23 Fri 25 Dec
24 Sat 26 Dec
25 Sun 27 Dec
26 Mon 28 Dec
27 Tue 29 Dec
28 Wed 30 Dec
How this calendar works

This app maps Gregorian dates into a 13-month calendar of thirteen 28-day months, plus Year Day at year-end and Leap Day in leap years. This is usually called the International Fixed Calendar model.

  • Each month has 28 days (exactly 4 weeks).
  • Year Day is outside all months.
  • Leap Day appears after June 28 in leap years.