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: 03-05 (32), 03-06 (32), 03-07 (32), 03-08 (32), 03-04 (31) — by astronomy; check the weather when the night is within four days.

2036-02-09astronomy score per night — click a bar for that night2036-03-09

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2036-02-09 Sat	9	—	unknown	05:10–05:50 (marginal, 0.67 h)	87.2° 12:05	10.49	94%	114.3°
2036-02-10 Sun	9	—	unknown	05:05–05:50 (marginal, 0.75 h)	87.2° 12:00	10.46	98%	118.8°
2036-02-11 Mon	9	—	unknown	05:05–06:20 (marginal, 1.25 h)	87.2° 11:55	10.42	100%	121.3°
2036-02-12 Tue	10	—	unknown	05:45–05:50 (good, 0.08 h)	87.2° 11:50	10.38	98%	121.4°
2036-02-13 Wed	11	—	unknown	05:45–05:50 (good, 0.08 h)	87.2° 11:45	10.34	94%	119.2°
2036-02-14 Thu	11	—	unknown	05:40–05:45 (good, 0.08 h)	87.2° 11:40	10.3	88%	115.2°
2036-02-15 Fri	11	—	unknown	05:40–05:45 (good, 0.08 h)	87.2° 11:35	10.26	80%	109.9°
2036-02-16 Sat	11	—	unknown	05:35–05:45 (good, 0.17 h)	87.2° 11:35	10.22	70%	103.9°
2036-02-17 Sun	13	—	unknown	05:30–05:45 (good, 0.25 h)	87.2° 11:30	10.18	60%	97.5°
2036-02-18 Mon	13	—	unknown	05:25–05:40 (good, 0.25 h)	87.2° 11:25	10.14	50%	91.0°
2036-02-19 Tue	15	—	unknown	05:20–05:40 (good, 0.33 h)	87.2° 11:20	10.1	41%	84.6°
2036-02-20 Wed	17	—	unknown	05:15–05:40 (good, 0.42 h)	87.2° 11:20	10.06	32%	78.5°
2036-02-21 Thu	18	—	unknown	05:05–05:35 (good, 0.5 h)	87.2° 11:15	10.02	23%	72.8°
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°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-02-09&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.