Rozhen Observation Calendar

Which nights are best for a target over the coming weeks. The astronomy mark (darkness × altitude × Moon) is computed for every night; the weather and the overall mark exist only where Open-Meteo has a forecast (the next four days) or ERA5 history (past nights) — the rest is honestly blank.

Best nights for North America Nebula: 03-03 (29), 03-02 (27), 03-01 (24), 02-28 (22), 02-27 (21) — by astronomy; check the weather when the night is within four days.

2046-02-02astronomy score per night — click a bar for that night2046-03-03

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2046-02-02 Fri	9	—	unknown	05:35–06:00 (marginal, 0.42 h)	87.2° 12:30	10.72	8%	76.3°
2046-02-03 Sat	9	—	unknown	05:30–06:00 (marginal, 0.5 h)	87.2° 12:25	10.69	4%	70.0°
2046-02-04 Sun	9	—	unknown	05:30–05:55 (marginal, 0.42 h)	87.1° 12:20	10.65	1%	64.4°
2046-02-05 Mon	9	—	unknown	05:25–05:55 (marginal, 0.5 h)	87.2° 12:20	10.62	0%	59.9°
2046-02-06 Tue	10	—	unknown	05:20–06:25 (marginal, 1.08 h)	87.2° 12:15	10.58	1%	56.7°
2046-02-07 Wed	10	—	unknown	05:50–05:55 (good, 0.08 h)	87.2° 12:10	10.54	4%	55.1°
2046-02-08 Thu	11	—	unknown	05:50–05:55 (good, 0.08 h)	87.2° 12:05	10.51	8%	55.1°
2046-02-09 Fri	11	—	unknown	05:45–05:50 (good, 0.08 h)	87.2° 12:00	10.47	14%	56.9°
2046-02-10 Sat	12	—	unknown	05:40–05:50 (good, 0.17 h)	87.2° 11:55	10.43	21%	60.1°
2046-02-11 Sun	12	—	unknown	05:35–05:50 (good, 0.25 h)	87.2° 11:50	10.4	29%	64.7°
2046-02-12 Mon	14	—	unknown	05:30–05:50 (good, 0.33 h)	87.2° 11:45	10.36	38%	70.3°
2046-02-13 Tue	13	—	unknown	05:30–05:45 (good, 0.25 h)	87.2° 11:45	10.32	48%	76.8°
2046-02-14 Wed	15	—	unknown	05:25–05:45 (good, 0.33 h)	87.2° 11:40	10.28	58%	84.0°
2046-02-15 Thu	16	—	unknown	05:20–05:45 (good, 0.42 h)	87.2° 11:35	10.24	68%	91.6°
2046-02-16 Fri	17	—	unknown	05:15–05:45 (good, 0.5 h)	87.2° 11:30	10.2	78%	99.4°
2046-02-17 Sat	16	—	unknown	05:25–05:40 (good, 0.25 h)	87.1° 11:25	10.16	87%	107.0°
2046-02-18 Sun	15	—	unknown	05:20–05:40 (good, 0.33 h)	87.2° 11:25	10.12	94%	114.1°
2046-02-19 Mon	16	—	unknown	05:15–05:40 (good, 0.42 h)	87.2° 11:20	10.08	98%	120.0°
2046-02-20 Tue	17	—	unknown	05:15–05:40 (good, 0.42 h)	87.2° 11:15	10.03	100%	123.8°
2046-02-21 Wed	17	—	unknown	05:10–05:35 (good, 0.42 h)	87.2° 11:10	9.99	98%	125.1°
2046-02-22 Thu	18	—	unknown	05:05–05:35 (good, 0.5 h)	87.2° 11:10	9.95	94%	123.5°
2046-02-23 Fri	18	—	unknown	05:00–05:35 (good, 0.58 h)	87.2° 11:05	9.91	87%	119.6°
2046-02-24 Sat	18	—	unknown	05:00–05:30 (good, 0.5 h)	87.2° 11:00	9.86	78%	113.8°
2046-02-25 Sun	19	—	unknown	04:55–05:30 (good, 0.58 h)	87.2° 10:55	9.82	68%	107.0°
2046-02-26 Mon	20	—	unknown	04:50–05:30 (good, 0.67 h)	87.2° 10:50	9.77	58%	99.7°
2046-02-27 Tue	21	—	unknown	04:45–05:30 (good, 0.75 h)	87.2° 10:50	9.73	47%	92.2°
2046-02-28 Wed	22	—	unknown	04:40–05:25 (good, 0.75 h)	87.2° 10:45	9.69	37%	84.9°
2046-03-01 Thu	24	—	unknown	04:30–05:25 (good, 0.92 h)	87.2° 10:40	9.64	28%	77.9°
2046-03-02 Fri	27	—	unknown	04:20–05:25 (good, 1.08 h)	87.2° 10:35	9.59	20%	71.4°
2046-03-03 Sat	29	—	unknown	04:15–05:20 (good, 1.08 h)	87.1° 10:30	9.55	12%	65.7°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2046-02-02&days=30"
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&days=30&format=csv" -o m31-calendar.csv

One row per night: score_astronomy always, score_weather / score only where a forecast or history exists (null otherwise, with weather_source saying which), best window, dark hours, Moon illumination and separation, transit. 7–60 nights. Errors: 400 with invalid_date or target_unresolved. Results are cached for six hours; calculation version 2026-10-10.1.