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: 07-28 (100), 07-29 (100), 07-30 (100), 07-31 (100), 08-01 (100) — by astronomy; check the weather when the night is within four days.

2032-07-28astronomy score per night — click a bar for that night2032-08-26

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-07-28 Wed	100	—	unknown	22:40–04:20 (good, 5.67 h)	71.1° 00:55	5.66	55%	83.7°
2032-07-29 Thu	100	—	unknown	22:40–04:20 (good, 5.67 h)	71.1° 00:50	5.71	44%	94.5°
2032-07-30 Fri	100	—	unknown	22:35–04:25 (good, 5.83 h)	71.1° 00:45	5.77	34%	104.8°
2032-07-31 Sat	100	—	unknown	22:35–04:25 (good, 5.83 h)	71.1° 00:45	5.82	25%	114.6°
2032-08-01 Sun	100	—	unknown	22:35–04:25 (good, 5.83 h)	71.1° 00:40	5.88	16%	123.6°
2032-08-02 Mon	100	—	unknown	22:30–04:30 (good, 6.0 h)	71.1° 00:35	5.93	10%	131.6°
2032-08-03 Tue	100	—	unknown	22:30–04:30 (good, 6.0 h)	71.1° 00:30	5.99	5%	137.9°
2032-08-04 Wed	100	—	unknown	22:30–04:30 (good, 6.0 h)	71.1° 00:25	6.05	2%	141.8°
2032-08-05 Thu	100	—	unknown	22:25–04:35 (good, 6.17 h)	71.1° 00:25	6.1	0%	142.7°
2032-08-06 Fri	100	—	unknown	22:25–04:35 (good, 6.17 h)	71.1° 00:20	6.16	1%	140.5°
2032-08-07 Sat	100	—	unknown	22:25–04:35 (good, 6.17 h)	71.1° 00:15	6.22	3%	135.6°
2032-08-08 Sun	100	—	unknown	22:20–04:35 (good, 6.25 h)	71.1° 00:10	6.27	7%	128.9°
2032-08-09 Mon	100	—	unknown	22:20–04:40 (good, 6.33 h)	71.1° 00:10	6.33	12%	120.9°
2032-08-10 Tue	100	—	unknown	22:15–04:40 (good, 6.42 h)	71.1° 00:05	6.39	19%	112.1°
2032-08-11 Wed	100	—	unknown	22:15–04:40 (good, 6.42 h)	71.1° 00:00	6.44	27%	102.7°
2032-08-12 Thu	100	—	unknown	22:15–04:45 (good, 6.5 h)	71.1° 23:55	6.5	36%	93.0°
2032-08-13 Fri	100	—	unknown	22:10–04:45 (good, 6.58 h)	71.1° 23:50	6.56	46%	83.0°
2032-08-14 Sat	100	—	unknown	22:10–04:45 (good, 6.58 h)	71.1° 23:50	6.62	56%	72.9°
2032-08-15 Sun	100	—	unknown	22:10–04:50 (good, 6.67 h)	71.1° 23:45	6.67	67%	62.8°
2032-08-16 Mon	96	—	unknown	22:05–04:45 (good, 6.67 h)	71.1° 23:40	6.73	77%	53.1°
2032-08-17 Tue	87	—	unknown	00:50–04:40 (good, 3.83 h)	71.1° 23:35	6.79	86%	44.7°
2032-08-18 Wed	63	—	unknown	04:25–04:40 (good, 0.25 h)	71.1° 23:30	6.85	93%	38.8°
2032-08-19 Thu	37	—	unknown	22:00–04:45 (marginal, 6.75 h)	71.1° 23:30	6.9	98%	37.2°
2032-08-20 Fri	37	—	unknown	22:00–04:30 (marginal, 6.5 h)	71.1° 23:25	6.96	100%	40.7°
2032-08-21 Sat	46	—	unknown	21:55–04:20 (marginal, 6.42 h)	71.1° 23:20	7.02	99%	48.2°
2032-08-22 Sun	61	—	unknown	21:55–23:05 (good, 1.17 h)	71.1° 23:15	7.08	95%	58.0°
2032-08-23 Mon	75	—	unknown	21:50–01:30 (good, 3.67 h)	71.1° 23:10	7.13	88%	69.0°
2032-08-24 Tue	100	—	unknown	21:50–02:50 (good, 5.0 h)	71.1° 23:10	7.19	80%	80.3°
2032-08-25 Wed	100	—	unknown	21:50–03:45 (good, 5.92 h)	71.1° 23:05	7.25	70%	91.4°
2032-08-26 Thu	100	—	unknown	21:45–03:55 (good, 6.17 h)	71.1° 23:00	7.3	59%	102.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-07-28&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.