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 HD 189733: 09-30 (100), 10-01 (100), 10-02 (100), 10-03 (100), 10-04 (100) — by astronomy; check the weather when the night is within four days.

2032-09-30astronomy score per night — click a bar for that night2032-10-29

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-09-30 Thu	100	—	unknown	20:40–01:50 (good, 5.17 h)	71.1° 20:45	9.16	12%	138.5°
2032-10-01 Fri	100	—	unknown	20:35–01:45 (good, 5.17 h)	71.1° 20:40	9.21	6%	132.6°
2032-10-02 Sat	100	—	unknown	20:35–01:40 (good, 5.08 h)	71.1° 20:35	9.25	2%	125.1°
2032-10-03 Sun	100	—	unknown	20:35–01:40 (good, 5.08 h)	71.1° 20:30	9.3	0%	116.6°
2032-10-04 Mon	100	—	unknown	20:30–01:35 (good, 5.08 h)	71.1° 20:25	9.35	0%	107.4°
2032-10-05 Tue	100	—	unknown	20:30–01:30 (good, 5.0 h)	71.1° 20:25	9.39	2%	97.7°
2032-10-06 Wed	100	—	unknown	20:30–01:25 (good, 4.92 h)	71.1° 20:20	9.44	5%	87.8°
2032-10-07 Thu	100	—	unknown	20:25–01:20 (good, 4.92 h)	71.1° 20:15	9.49	11%	77.8°
2032-10-08 Fri	100	—	unknown	20:25–01:20 (good, 4.92 h)	71.1° 20:10	9.53	18%	67.8°
2032-10-09 Sat	100	—	unknown	20:25–01:15 (good, 4.83 h)	71.1° 20:10	9.58	27%	58.2°
2032-10-10 Sun	94	—	unknown	20:20–01:10 (good, 4.83 h)	71.1° 20:05	9.62	37%	49.4°
2032-10-11 Mon	85	—	unknown	20:20–01:05 (good, 4.75 h)	71.1° 20:00	9.67	47%	42.2°
2032-10-12 Tue	60	—	unknown	20:20–00:40 (good, 4.33 h)	71.1° 19:55	9.71	59%	37.7°
2032-10-13 Wed	45	—	unknown	20:15–01:20 (marginal, 5.08 h)	71.1° 19:50	9.76	70%	37.4°
2032-10-14 Thu	36	—	unknown	20:15–01:10 (marginal, 4.92 h)	71.1° 19:50	9.8	80%	41.5°
2032-10-15 Fri	34	—	unknown	20:15–00:55 (marginal, 4.67 h)	71.1° 19:45	9.84	88%	49.3°
2032-10-16 Sat	36	—	unknown	20:15–00:50 (marginal, 4.58 h)	71.1° 19:40	9.89	95%	59.1°
2032-10-17 Sun	43	—	unknown	20:10–21:10 (good, 1.0 h)	71.1° 19:35	9.93	99%	70.2°
2032-10-18 Mon	54	—	unknown	20:10–22:20 (good, 2.17 h)	71.1° 19:30	9.97	100%	81.7°
2032-10-19 Tue	68	—	unknown	20:10–23:25 (good, 3.25 h)	71.1° 19:30	10.01	98%	93.3°
2032-10-20 Wed	83	—	unknown	20:05–00:10 (good, 4.08 h)	71.1° 19:25	10.06	94%	104.5°
2032-10-21 Thu	100	—	unknown	20:05–00:15 (good, 4.17 h)	71.1° 19:20	10.1	88%	115.1°
2032-10-22 Fri	100	—	unknown	20:05–00:15 (good, 4.17 h)	71.1° 19:15	10.14	80%	124.6°
2032-10-23 Sat	100	—	unknown	20:05–00:10 (good, 4.08 h)	71.1° 19:15	10.18	71%	132.8°
2032-10-24 Sun	100	—	unknown	20:00–00:10 (good, 4.17 h)	71.1° 19:10	10.22	62%	139.0°
2032-10-25 Mon	100	—	unknown	20:00–00:10 (good, 4.17 h)	71.1° 19:05	10.26	52%	142.5°
2032-10-26 Tue	100	—	unknown	20:00–00:05 (good, 4.08 h)	71.1° 19:00	10.3	42%	142.8°
2032-10-27 Wed	100	—	unknown	20:00–00:05 (good, 4.08 h)	71.1° 18:55	10.34	33%	140.0°
2032-10-28 Thu	100	—	unknown	19:55–00:00 (good, 4.08 h)	71.1° 18:55	10.37	24%	134.6°
2032-10-29 Fri	100	—	unknown	19:55–23:55 (good, 4.0 h)	71.1° 18:50	10.41	17%	127.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-09-30&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.