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 3C 273: 05-10 (93), 05-11 (93), 05-12 (91), 05-13 (86), 05-14 (79) — by astronomy; check the weather when the night is within four days.

2032-05-10astronomy score per night — click a bar for that night2032-06-08

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-05-10 Mon	93	—	unknown	22:25–02:25 (good, 4.0 h)	50.2° 22:35	5.82	2%	118.5°
2032-05-11 Tue	93	—	unknown	22:25–02:25 (good, 4.0 h)	50.2° 22:30	5.76	6%	105.7°
2032-05-12 Wed	91	—	unknown	22:30–02:20 (good, 3.83 h)	50.2° 22:25	5.71	12%	93.2°
2032-05-13 Thu	86	—	unknown	22:30–02:15 (good, 3.75 h)	50.2° 22:25	5.66	19%	81.0°
2032-05-14 Fri	79	—	unknown	22:30–02:10 (good, 3.67 h)	50.2° 22:20	5.6	27%	69.0°
2032-05-15 Sat	69	—	unknown	22:35–02:05 (good, 3.5 h)	50.2° 22:15	5.55	36%	57.2°
2032-05-16 Sun	55	—	unknown	22:35–02:05 (good, 3.5 h)	50.2° 22:10	5.5	46%	45.5°
2032-05-17 Mon	40	—	unknown	22:35–01:30 (good, 2.92 h)	50.2° 22:10	5.44	55%	33.9°
2032-05-18 Tue	30	—	unknown	22:40–02:20 (marginal, 3.67 h)	50.2° 22:05	5.39	64%	22.5°
2032-05-19 Wed	23	—	unknown	22:40–02:10 (marginal, 3.5 h)	50.2° 22:00	5.34	73%	11.9°
2032-05-20 Thu	18	—	unknown	22:40–02:00 (marginal, 3.33 h)	50.2° 21:55	5.29	82%	8.3°
2032-05-21 Fri	14	—	unknown	22:45–01:45 (marginal, 3.0 h)	50.2° 21:50	5.24	89%	17.5°
2032-05-22 Sat	13	—	unknown	22:45–01:30 (marginal, 2.75 h)	50.2° 21:50	5.2	94%	29.7°
2032-05-23 Sun	17	—	unknown	22:45–01:35 (marginal, 2.83 h)	50.2° 21:45	5.15	98%	42.6°
2032-05-24 Mon	23	—	unknown	22:45–01:40 (marginal, 2.92 h)	50.2° 21:40	5.1	100%	56.0°
2032-05-25 Tue	30	—	unknown	22:50–23:15 (good, 0.42 h)	50.2° 21:35	5.06	99%	69.8°
2032-05-26 Wed	39	—	unknown	22:50–00:40 (good, 1.83 h)	50.2° 21:30	5.01	96%	83.8°
2032-05-27 Thu	55	—	unknown	22:50–01:00 (good, 2.17 h)	50.2° 21:30	4.97	90%	98.0°
2032-05-28 Fri	57	—	unknown	22:55–01:05 (good, 2.17 h)	50.2° 21:25	4.93	82%	112.3°
2032-05-29 Sat	57	—	unknown	22:55–01:05 (good, 2.17 h)	50.2° 21:20	4.89	72%	126.5°
2032-05-30 Sun	56	—	unknown	22:55–01:10 (good, 2.25 h)	50.2° 21:15	4.85	61%	140.5°
2032-05-31 Mon	56	—	unknown	22:55–01:05 (good, 2.17 h)	50.2° 21:15	4.81	49%	154.2°
2032-06-01 Tue	52	—	unknown	23:00–01:00 (good, 2.0 h)	50.2° 21:10	4.78	38%	166.9°
2032-06-02 Wed	51	—	unknown	23:00–00:55 (good, 1.92 h)	50.2° 21:05	4.74	28%	171.7°
2032-06-03 Thu	49	—	unknown	23:00–00:55 (good, 1.92 h)	50.2° 21:00	4.71	18%	161.4°
2032-06-04 Fri	47	—	unknown	23:00–00:50 (good, 1.83 h)	50.2° 20:55	4.68	11%	148.6°
2032-06-05 Sat	45	—	unknown	23:05–00:45 (good, 1.67 h)	50.2° 20:55	4.65	5%	135.6°
2032-06-06 Sun	43	—	unknown	23:05–00:40 (good, 1.58 h)	50.2° 20:50	4.62	1%	122.7°
2032-06-07 Mon	41	—	unknown	23:05–00:35 (good, 1.5 h)	50.2° 20:45	4.59	0%	109.9°
2032-06-08 Tue	40	—	unknown	23:05–00:35 (good, 1.5 h)	50.2° 20:40	4.57	1%	97.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-05-10&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.