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: 03-22 (41), 03-21 (37), 03-20 (33), 03-05 (32), 03-06 (32) — by astronomy; check the weather when the night is within four days.

2036-02-22astronomy score per night — click a bar for that night2036-03-22

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2036-02-22 Fri	20	—	unknown	05:00–05:35 (good, 0.58 h)	87.2° 11:10	9.97	16%	67.8°
2036-02-23 Sat	22	—	unknown	04:50–05:35 (good, 0.75 h)	87.2° 11:05	9.93	10%	63.6°
2036-02-24 Sun	24	—	unknown	04:45–05:35 (good, 0.83 h)	87.2° 11:00	9.89	5%	60.5°
2036-02-25 Mon	24	—	unknown	04:45–05:30 (good, 0.75 h)	87.2° 11:00	9.84	2%	58.7°
2036-02-26 Tue	24	—	unknown	04:40–05:30 (good, 0.83 h)	87.2° 10:55	9.8	0%	58.4°
2036-02-27 Wed	26	—	unknown	04:35–05:30 (good, 0.92 h)	87.2° 10:50	9.76	0%	59.7°
2036-02-28 Thu	26	—	unknown	04:30–05:25 (good, 0.92 h)	87.2° 10:45	9.71	3%	62.6°
2036-02-29 Fri	28	—	unknown	04:25–05:25 (good, 1.0 h)	87.2° 10:40	9.67	7%	66.8°
2036-03-01 Sat	28	—	unknown	04:25–05:25 (good, 1.0 h)	87.2° 10:40	9.62	14%	72.1°
2036-03-02 Sun	28	—	unknown	04:20–05:20 (good, 1.0 h)	87.2° 10:35	9.57	22%	78.2°
2036-03-03 Mon	30	—	unknown	04:15–05:20 (good, 1.08 h)	87.2° 10:30	9.53	31%	85.0°
2036-03-04 Tue	31	—	unknown	04:10–05:20 (good, 1.17 h)	87.2° 10:25	9.48	42%	92.1°
2036-03-05 Wed	32	—	unknown	04:05–05:20 (good, 1.25 h)	87.2° 10:20	9.44	53%	99.2°
2036-03-06 Thu	32	—	unknown	04:05–05:15 (good, 1.17 h)	87.2° 10:20	9.39	64%	106.1°
2036-03-07 Fri	32	—	unknown	04:00–05:15 (good, 1.25 h)	87.2° 10:15	9.34	75%	112.2°
2036-03-08 Sat	32	—	unknown	04:05–05:15 (good, 1.17 h)	87.2° 10:10	9.29	84%	117.2°
2036-03-09 Sun	29	—	unknown	04:00–05:10 (good, 1.17 h)	87.2° 10:05	9.24	92%	120.5°
2036-03-10 Mon	28	—	unknown	04:00–05:10 (good, 1.17 h)	87.2° 10:05	9.2	97%	121.6°
2036-03-11 Tue	28	—	unknown	04:00–05:05 (good, 1.08 h)	87.2° 10:00	9.15	100%	120.5°
2036-03-12 Wed	28	—	unknown	03:55–05:05 (good, 1.17 h)	87.2° 09:55	9.1	100%	117.2°
2036-03-13 Thu	27	—	unknown	03:55–05:05 (good, 1.17 h)	87.2° 09:50	9.05	97%	112.4°
2036-03-14 Fri	25	—	unknown	03:55–05:00 (good, 1.08 h)	87.2° 09:45	9.0	92%	106.5°
2036-03-15 Sat	25	—	unknown	03:55–05:00 (good, 1.08 h)	87.2° 09:45	8.95	85%	100.1°
2036-03-16 Sun	25	—	unknown	03:50–05:00 (good, 1.17 h)	87.2° 09:40	8.9	77%	93.4°
2036-03-17 Mon	26	—	unknown	03:45–04:55 (good, 1.17 h)	87.2° 09:35	8.85	68%	86.8°
2036-03-18 Tue	28	—	unknown	03:35–04:55 (good, 1.33 h)	87.2° 09:30	8.8	58%	80.5°
2036-03-19 Wed	30	—	unknown	03:30–04:55 (good, 1.42 h)	87.2° 09:25	8.74	48%	74.7°
2036-03-20 Thu	33	—	unknown	03:20–04:50 (good, 1.5 h)	87.2° 09:25	8.69	39%	69.4°
2036-03-21 Fri	37	—	unknown	03:05–04:50 (good, 1.75 h)	87.2° 09:20	8.64	30%	64.9°
2036-03-22 Sat	41	—	unknown	03:00–04:45 (good, 1.75 h)	87.2° 09:15	8.59	22%	61.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-02-22&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.