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 Seven Sisters: 10-26 (100), 10-27 (100), 10-28 (100), 10-29 (100), 10-30 (100) — by astronomy; check the weather when the night is within four days.

2032-10-21astronomy score per night — click a bar for that night2032-11-19

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-10-21 Thu	35	—	unknown	21:50–06:10 (marginal, 8.33 h)	72.6° 03:05	10.1	88%	12.7°
2032-10-22 Fri	50	—	unknown	21:30–06:10 (marginal, 8.67 h)	72.6° 03:00	10.14	80%	24.9°
2032-10-23 Sat	81	—	unknown	22:40–01:25 (good, 2.75 h)	72.6° 03:00	10.18	71%	37.5°
2032-10-24 Sun	88	—	unknown	21:50–05:25 (good, 7.58 h)	72.6° 02:55	10.22	62%	49.8°
2032-10-25 Mon	96	—	unknown	21:45–06:15 (good, 8.5 h)	72.6° 02:50	10.26	52%	61.8°
2032-10-26 Tue	100	—	unknown	21:40–06:15 (good, 8.58 h)	72.6° 02:45	10.3	42%	73.7°
2032-10-27 Wed	100	—	unknown	21:35–06:20 (good, 8.75 h)	72.6° 02:40	10.34	33%	85.5°
2032-10-28 Thu	100	—	unknown	21:30–06:20 (good, 8.83 h)	72.6° 02:40	10.37	24%	97.2°
2032-10-29 Fri	100	—	unknown	21:30–06:20 (good, 8.83 h)	72.6° 02:35	10.41	17%	109.0°
2032-10-30 Sat	100	—	unknown	21:25–05:20 (good, 8.92 h)	72.6° 02:30	10.45	10%	120.8°
2032-10-31 Sun	100	—	unknown	20:20–05:20 (good, 9.0 h)	72.6° 01:25	10.49	5%	132.8°
2032-11-01 Mon	100	—	unknown	20:15–05:25 (good, 9.17 h)	72.6° 01:20	10.52	2%	144.9°
2032-11-02 Tue	100	—	unknown	20:10–05:25 (good, 9.25 h)	72.6° 01:20	10.56	0%	157.0°
2032-11-03 Wed	100	—	unknown	20:10–05:25 (good, 9.25 h)	72.6° 01:15	10.59	0%	168.5°
2032-11-04 Thu	100	—	unknown	20:05–05:25 (good, 9.33 h)	72.6° 01:10	10.63	3%	172.4°
2032-11-05 Fri	100	—	unknown	20:00–05:25 (good, 9.42 h)	72.6° 01:05	10.66	8%	161.9°
2032-11-06 Sat	100	—	unknown	19:55–05:30 (good, 9.58 h)	72.6° 01:05	10.7	14%	149.2°
2032-11-07 Sun	100	—	unknown	19:55–05:30 (good, 9.58 h)	72.6° 01:00	10.73	23%	135.9°
2032-11-08 Mon	100	—	unknown	19:50–05:30 (good, 9.67 h)	72.6° 00:55	10.76	33%	122.3°
2032-11-09 Tue	100	—	unknown	19:50–05:30 (good, 9.67 h)	72.6° 00:50	10.79	44%	108.6°
2032-11-10 Wed	100	—	unknown	19:55–05:35 (good, 9.67 h)	72.6° 00:45	10.83	55%	94.6°
2032-11-11 Thu	100	—	unknown	20:05–05:35 (good, 9.5 h)	72.6° 00:45	10.86	66%	80.5°
2032-11-12 Fri	100	—	unknown	21:40–05:35 (good, 7.92 h)	72.6° 00:40	10.89	77%	66.3°
2032-11-13 Sat	93	—	unknown	01:05–05:35 (good, 4.5 h)	72.6° 00:35	10.92	86%	52.0°
2032-11-14 Sun	83	—	unknown	04:45–05:35 (good, 0.83 h)	72.6° 00:30	10.95	93%	37.8°
2032-11-15 Mon	39	—	unknown	00:50–05:40 (marginal, 4.83 h)	72.6° 00:25	10.97	98%	23.9°
2032-11-16 Tue	29	—	unknown	02:25–05:35 (marginal, 3.17 h)	72.6° 00:25	11.0	100%	11.1°
2032-11-17 Wed	28	—	unknown	19:20–21:55 (marginal, 2.58 h)	72.6° 00:20	11.03	99%	8.4°
2032-11-18 Thu	36	—	unknown	19:00–23:30 (marginal, 4.5 h)	72.6° 00:15	11.06	97%	19.7°
2032-11-19 Fri	65	—	unknown	19:05–19:15 (good, 0.17 h)	72.6° 00:10	11.08	92%	32.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-10-21&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.