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), 03-02 (62), 03-03 (60), 03-04 (58), 03-05 (57) — by astronomy; check the weather when the night is within four days.

2032-03-01astronomy score per night — click a bar for that night2032-03-30

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2032-03-17 Wed	18	—	unknown	19:35–22:05 (marginal, 2.5 h)	42.9° 18:15	8.85	41%	26.1°
2032-03-18 Thu	14	—	unknown	20:05–21:55 (marginal, 1.83 h)	42.9° 18:10	8.8	51%	25.5°
2032-03-19 Fri	10	—	unknown	20:10–21:40 (marginal, 1.5 h)	42.9° 18:05	8.75	60%	30.0°
2032-03-20 Sat	8	—	unknown	20:10–21:25 (marginal, 1.25 h)	42.9° 18:05	8.69	69%	37.5°
2032-03-21 Sun	7	—	unknown	20:10–21:20 (marginal, 1.17 h)	42.9° 18:00	8.64	78%	46.6°
2032-03-22 Mon	8	—	unknown	20:10–21:20 (marginal, 1.17 h)	42.9° 17:55	8.59	85%	56.5°
2032-03-23 Tue	8	—	unknown	20:15–21:20 (marginal, 1.08 h)	42.9° 17:50	8.54	91%	66.9°
2032-03-24 Wed	10	—	unknown	20:15–21:25 (marginal, 1.17 h)	42.9° 17:45	8.48	96%	77.6°
2032-03-25 Thu	12	—	unknown	20:15–21:30 (marginal, 1.25 h)	42.9° 17:45	8.43	99%	88.6°
2032-03-26 Fri	14	—	unknown	20:15–20:30 (good, 0.25 h)	42.9° 17:40	8.38	100%	99.7°
2032-03-27 Sat	15	—	unknown	20:20–20:40 (good, 0.33 h)	42.9° 17:35	8.32	99%	110.9°
2032-03-28 Sun	17	—	unknown	21:20–21:40 (good, 0.33 h)	42.9° 18:30	8.27	96%	122.1°
2032-03-29 Mon	16	—	unknown	21:20–21:45 (good, 0.42 h)	42.9° 18:30	8.22	92%	133.0°
2032-03-30 Tue	13	—	unknown	21:25–21:45 (good, 0.33 h)	42.9° 18:25	8.16	85%	143.1°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-03-01&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.