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: 06-10 (37), 06-11 (34), 06-12 (30), 06-13 (24), 06-14 (20) — by astronomy; check the weather when the night is within four days.

2032-06-10astronomy score per night — click a bar for that night2032-07-09

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-06-10 Thu	37	—	unknown	23:05–00:25 (good, 1.33 h)	50.2° 20:35	4.52	8%	72.9°
2032-06-11 Fri	34	—	unknown	23:10–00:20 (good, 1.17 h)	50.2° 20:30	4.5	14%	61.0°
2032-06-12 Sat	30	—	unknown	23:10–00:15 (good, 1.08 h)	50.2° 20:25	4.49	22%	49.3°
2032-06-13 Sun	24	—	unknown	23:10–00:00 (good, 0.83 h)	50.2° 20:20	4.47	30%	37.6°
2032-06-14 Mon	20	—	unknown	23:10–23:50 (good, 0.67 h)	50.2° 20:20	4.46	39%	26.2°
2032-06-15 Tue	16	—	unknown	23:10–23:35 (good, 0.42 h)	50.2° 20:15	4.45	48%	15.2°
2032-06-16 Wed	13	—	unknown	23:10–00:30 (marginal, 1.33 h)	50.2° 20:10	4.44	58%	7.6°
2032-06-17 Thu	10	—	unknown	23:10–00:15 (marginal, 1.08 h)	50.2° 20:05	4.43	67%	13.5°
2032-06-18 Fri	7	—	unknown	23:10–00:05 (marginal, 0.92 h)	50.2° 20:00	4.43	76%	24.9°
2032-06-19 Sat	7	—	unknown	23:10–23:55 (marginal, 0.75 h)	50.2° 20:00	4.42	85%	37.5°
2032-06-20 Sun	7	—	unknown	23:15–23:55 (marginal, 0.67 h)	50.2° 19:55	4.42	92%	50.7°
2032-06-21 Mon	7	—	unknown	23:15–23:55 (marginal, 0.67 h)	50.2° 19:50	4.42	97%	64.4°
2032-06-22 Tue	8	—	unknown	23:15–00:00 (marginal, 0.75 h)	50.2° 19:45	4.43	100%	78.5°
2032-06-23 Wed	10	—	unknown	23:15–00:00 (marginal, 0.75 h)	50.2° 19:40	4.43	100%	92.9°
2032-06-24 Thu	11	—	unknown	22:20–00:00 (marginal, 1.67 h)	50.2° 19:40	4.44	97%	107.5°
2032-06-25 Fri	12	—	unknown	23:15–23:20 (good, 0.08 h)	50.2° 19:35	4.45	91%	122.1°
2032-06-26 Sat	11	—	unknown	22:20–23:50 (marginal, 1.5 h)	50.2° 19:30	4.46	84%	136.7°
2032-06-27 Sun	11	—	unknown	23:15–23:20 (good, 0.08 h)	50.2° 19:25	4.48	74%	150.9°
2032-06-28 Mon	11	—	unknown	23:10–23:15 (good, 0.08 h)	50.2° 19:25	4.49	63%	164.3°
2032-06-29 Tue	10	—	unknown	22:20–23:40 (marginal, 1.33 h)	50.2° 19:20	4.51	52%	172.5°
2032-06-30 Wed	8	—	unknown	22:20–23:05 (marginal, 0.75 h)	50.2° 19:15	4.53	41%	164.2°
2032-07-01 Thu	7	—	unknown	22:20–23:05 (marginal, 0.75 h)	50.2° 19:10	4.55	30%	151.6°
2032-07-02 Fri	6	—	unknown	22:20–23:00 (marginal, 0.67 h)	50.2° 19:05	4.57	21%	138.7°
2032-07-03 Sat	6	—	unknown	22:20–22:55 (marginal, 0.58 h)	50.2° 19:05	4.6	13%	125.9°
2032-07-04 Sun	5	—	unknown	22:20–22:50 (marginal, 0.5 h)	50.2° 19:00	4.63	7%	113.3°
2032-07-05 Mon	4	—	unknown	22:20–22:45 (marginal, 0.42 h)	50.2° 18:55	4.65	3%	100.8°
2032-07-06 Tue	3	—	unknown	22:15–22:45 (marginal, 0.5 h)	50.2° 18:50	4.68	1%	88.5°
2032-07-07 Wed	3	—	unknown	22:15–22:40 (marginal, 0.42 h)	50.2° 18:45	4.72	0%	76.4°
2032-07-08 Thu	3	—	unknown	22:15–22:35 (marginal, 0.33 h)	50.2° 18:45	4.75	2%	64.5°
2032-07-09 Fri	2	—	unknown	22:15–22:30 (marginal, 0.25 h)	50.2° 18:40	4.78	5%	52.7°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-06-10&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.