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 Great Orion Nebula: 03-01 (64), 02-29 (63), 03-02 (62), 02-28 (60), 03-03 (60) — by astronomy; check the weather when the night is within four days.

2032-02-16astronomy score per night — click a bar for that night2032-03-16

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-02-16 Mon	56	—	unknown	19:30–23:15 (good, 3.75 h)	42.9° 20:15	10.22	38%	47.3°
2032-02-17 Tue	42	—	unknown	20:10–22:45 (good, 2.58 h)	42.9° 20:10	10.18	48%	37.4°
2032-02-18 Wed	29	—	unknown	19:35–23:50 (marginal, 4.25 h)	42.9° 20:05	10.14	58%	29.6°
2032-02-19 Thu	20	—	unknown	19:35–23:30 (marginal, 3.92 h)	42.9° 20:00	10.1	67%	25.6°
2032-02-20 Fri	14	—	unknown	19:35–23:10 (marginal, 3.58 h)	42.9° 19:55	10.06	76%	26.6°
2032-02-21 Sat	12	—	unknown	19:35–22:45 (marginal, 3.17 h)	42.9° 19:55	10.02	84%	32.1°
2032-02-22 Sun	13	—	unknown	19:35–22:35 (marginal, 3.0 h)	42.9° 19:50	9.98	90%	40.1°
2032-02-23 Mon	16	—	unknown	19:40–22:45 (marginal, 3.08 h)	42.9° 19:45	9.93	95%	49.4°
2032-02-24 Tue	21	—	unknown	19:40–22:55 (marginal, 3.25 h)	42.9° 19:40	9.89	98%	59.5°
2032-02-25 Wed	28	—	unknown	19:40–23:05 (marginal, 3.42 h)	42.9° 19:35	9.85	100%	69.9°
2032-02-26 Thu	36	—	unknown	19:40–20:55 (good, 1.25 h)	42.9° 19:35	9.8	100%	80.7°
2032-02-27 Fri	44	—	unknown	19:45–22:10 (good, 2.42 h)	42.9° 19:30	9.76	98%	91.6°
2032-02-28 Sat	60	—	unknown	19:45–22:25 (good, 2.67 h)	42.9° 19:25	9.71	94%	102.7°
2032-02-29 Sun	63	—	unknown	19:45–22:30 (good, 2.75 h)	42.9° 19:20	9.67	88%	113.8°
2032-03-01 Mon	64	—	unknown	19:45–22:35 (good, 2.83 h)	42.9° 19:20	9.62	81%	124.8°
2032-03-02 Tue	62	—	unknown	19:50–22:35 (good, 2.75 h)	42.9° 19:15	9.58	72%	135.4°
2032-03-03 Wed	60	—	unknown	19:50–22:30 (good, 2.67 h)	42.9° 19:10	9.53	62%	145.1°
2032-03-04 Thu	58	—	unknown	19:50–22:25 (good, 2.58 h)	42.9° 19:05	9.48	52%	152.4°
2032-03-05 Fri	57	—	unknown	19:50–22:20 (good, 2.5 h)	42.9° 19:00	9.44	40%	154.7°
2032-03-06 Sat	55	—	unknown	19:55–22:15 (good, 2.33 h)	42.9° 19:00	9.39	30%	150.3°
2032-03-07 Sun	53	—	unknown	19:55–22:15 (good, 2.33 h)	42.9° 18:55	9.34	20%	141.0°
2032-03-08 Mon	51	—	unknown	19:55–22:10 (good, 2.25 h)	42.9° 18:50	9.29	11%	129.3°
2032-03-09 Tue	50	—	unknown	19:55–22:05 (good, 2.17 h)	42.9° 18:45	9.25	5%	116.5°
2032-03-10 Wed	48	—	unknown	19:55–22:00 (good, 2.08 h)	42.9° 18:40	9.2	1%	103.1°
2032-03-11 Thu	46	—	unknown	20:00–21:55 (good, 1.92 h)	42.9° 18:40	9.15	0%	89.6°
2032-03-12 Fri	45	—	unknown	20:00–21:55 (good, 1.92 h)	42.9° 18:35	9.1	2%	76.3°
2032-03-13 Sat	41	—	unknown	20:00–21:50 (good, 1.83 h)	42.9° 18:30	9.05	7%	63.5°
2032-03-14 Sun	37	—	unknown	20:00–21:40 (good, 1.67 h)	42.9° 18:25	9.0	14%	51.5°
2032-03-15 Mon	31	—	unknown	20:05–21:30 (good, 1.42 h)	42.9° 18:25	8.95	22%	40.7°
2032-03-16 Tue	24	—	unknown	20:05–21:15 (good, 1.17 h)	42.9° 18:20	8.9	31%	31.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-02-16&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.