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: 10-14 (100), 10-15 (100), 10-16 (100), 10-17 (100), 10-18 (100) — by astronomy; check the weather when the night is within four days.

2036-10-10astronomy score per night — click a bar for that night2036-11-08

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2036-10-10 Fri	56	—	unknown	22:15–06:00 (marginal, 7.75 h)	72.5° 03:50	9.63	70%	26.2°
2036-10-11 Sat	81	—	unknown	22:40–04:50 (good, 6.17 h)	72.5° 03:45	9.67	59%	39.3°
2036-10-12 Sun	89	—	unknown	22:35–06:00 (good, 7.42 h)	72.5° 03:40	9.71	48%	52.9°
2036-10-13 Mon	98	—	unknown	22:30–06:05 (good, 7.58 h)	72.5° 03:35	9.76	37%	66.8°
2036-10-14 Tue	100	—	unknown	22:25–06:05 (good, 7.67 h)	72.5° 03:35	9.8	26%	80.9°
2036-10-15 Wed	100	—	unknown	22:25–06:05 (good, 7.67 h)	72.5° 03:30	9.85	17%	95.2°
2036-10-16 Thu	100	—	unknown	22:20–06:05 (good, 7.75 h)	72.5° 03:25	9.89	9%	109.5°
2036-10-17 Fri	100	—	unknown	22:15–06:05 (good, 7.83 h)	72.5° 03:20	9.93	3%	123.8°
2036-10-18 Sat	100	—	unknown	22:10–06:10 (good, 8.0 h)	72.5° 03:15	9.97	1%	137.9°
2036-10-19 Sun	100	—	unknown	22:10–06:10 (good, 8.0 h)	72.5° 03:15	10.02	0%	151.5°
2036-10-20 Mon	100	—	unknown	22:05–06:10 (good, 8.08 h)	72.5° 03:10	10.06	3%	164.0°
2036-10-21 Tue	100	—	unknown	22:00–06:10 (good, 8.17 h)	72.5° 03:05	10.1	7%	171.0°
2036-10-22 Wed	100	—	unknown	21:55–06:10 (good, 8.25 h)	72.5° 03:00	10.14	14%	164.0°
2036-10-23 Thu	100	—	unknown	21:50–06:15 (good, 8.42 h)	72.5° 03:00	10.18	21%	152.5°
2036-10-24 Fri	100	—	unknown	21:50–06:15 (good, 8.42 h)	72.5° 02:55	10.22	30%	140.6°
2036-10-25 Sat	100	—	unknown	21:45–05:15 (good, 8.5 h)	72.5° 02:50	10.26	39%	128.7°
2036-10-26 Sun	100	—	unknown	20:45–05:15 (good, 8.5 h)	72.5° 01:45	10.3	49%	117.0°
2036-10-27 Mon	100	—	unknown	20:45–05:20 (good, 8.58 h)	72.5° 01:40	10.34	58%	105.3°
2036-10-28 Tue	100	—	unknown	20:50–05:20 (good, 8.5 h)	72.5° 01:40	10.37	67%	93.6°
2036-10-29 Wed	100	—	unknown	21:05–05:20 (good, 8.25 h)	72.5° 01:35	10.41	76%	81.8°
2036-10-30 Thu	100	—	unknown	22:25–05:20 (good, 6.92 h)	72.5° 01:30	10.45	83%	69.9°
2036-10-31 Fri	97	—	unknown	01:00–05:20 (good, 4.33 h)	72.5° 01:25	10.49	90%	57.9°
2036-11-01 Sat	89	—	unknown	04:40–05:25 (good, 0.75 h)	72.5° 01:20	10.52	95%	45.7°
2036-11-02 Sun	44	—	unknown	22:50–05:25 (marginal, 6.58 h)	72.5° 01:20	10.56	98%	33.3°
2036-11-03 Mon	32	—	unknown	02:10–05:25 (marginal, 3.25 h)	72.5° 01:15	10.59	100%	21.1°
2036-11-04 Tue	26	—	unknown	03:15–05:25 (marginal, 2.17 h)	72.5° 01:10	10.63	99%	10.7°
2036-11-05 Wed	31	—	unknown	19:55–00:00 (marginal, 4.08 h)	72.5° 01:05	10.66	96%	11.7°
2036-11-06 Thu	42	—	unknown	19:40–03:35 (marginal, 7.92 h)	72.5° 01:05	10.7	90%	23.0°
2036-11-07 Fri	74	—	unknown	19:55–20:15 (good, 0.33 h)	72.5° 01:00	10.73	83%	36.2°
2036-11-08 Sat	87	—	unknown	19:50–01:05 (good, 5.25 h)	72.5° 00:55	10.76	73%	49.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-10-10&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.