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: 10-06 (100), 10-07 (100), 10-08 (100), 10-09 (100), 10-10 (100) — by astronomy; check the weather when the night is within four days.

2043-10-06astronomy score per night — click a bar for that night2043-11-04

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2043-10-06 Tue	100	—	unknown	23:00–05:55 (good, 6.92 h)	72.5° 04:10	9.41	13%	175.9°
2043-10-07 Wed	100	—	unknown	23:00–05:55 (good, 6.92 h)	72.6° 04:05	9.46	20%	172.2°
2043-10-08 Thu	100	—	unknown	22:55–05:55 (good, 7.0 h)	72.6° 04:00	9.5	28%	160.4°
2043-10-09 Fri	100	—	unknown	22:50–05:55 (good, 7.08 h)	72.6° 03:55	9.55	37%	148.5°
2043-10-10 Sat	100	—	unknown	22:50–06:00 (good, 7.17 h)	72.5° 03:50	9.59	46%	136.6°
2043-10-11 Sun	100	—	unknown	22:45–06:00 (good, 7.25 h)	72.5° 03:50	9.64	56%	124.4°
2043-10-12 Mon	100	—	unknown	22:45–06:00 (good, 7.25 h)	72.6° 03:45	9.68	66%	111.9°
2043-10-13 Tue	100	—	unknown	22:50–06:00 (good, 7.17 h)	72.6° 03:40	9.73	75%	99.1°
2043-10-14 Wed	100	—	unknown	23:10–06:05 (good, 6.92 h)	72.6° 03:35	9.77	84%	85.8°
2043-10-15 Thu	100	—	unknown	00:45–06:05 (good, 5.33 h)	72.5° 03:30	9.82	91%	72.0°
2043-10-16 Fri	96	—	unknown	03:55–06:05 (good, 2.17 h)	72.6° 03:30	9.86	96%	57.9°
2043-10-17 Sat	46	—	unknown	22:40–06:05 (marginal, 7.42 h)	72.6° 03:25	9.9	100%	43.3°
2043-10-18 Sun	24	—	unknown	03:55–06:05 (marginal, 2.17 h)	72.6° 03:20	9.94	100%	28.5°
2043-10-19 Mon	21	—	unknown	04:50–06:10 (marginal, 1.33 h)	72.6° 03:15	9.99	97%	13.5°
2043-10-20 Tue	25	—	unknown	22:10–02:00 (marginal, 3.83 h)	72.5° 03:15	10.03	91%	1.6°
2043-10-21 Wed	37	—	unknown	21:50–06:10 (marginal, 8.33 h)	72.6° 03:10	10.07	84%	16.4°
2043-10-22 Thu	54	—	unknown	21:35–06:10 (marginal, 8.58 h)	72.6° 03:05	10.11	74%	30.9°
2043-10-23 Fri	81	—	unknown	21:55–04:05 (good, 6.17 h)	72.6° 03:00	10.15	63%	45.2°
2043-10-24 Sat	91	—	unknown	21:50–05:15 (good, 8.42 h)	72.5° 02:55	10.19	52%	59.1°
2043-10-25 Sun	100	—	unknown	20:45–05:15 (good, 8.5 h)	72.5° 01:55	10.23	41%	72.7°
2043-10-26 Mon	100	—	unknown	20:45–05:15 (good, 8.5 h)	72.6° 01:50	10.27	31%	85.9°
2043-10-27 Tue	100	—	unknown	20:40–05:15 (good, 8.58 h)	72.6° 01:45	10.31	22%	98.9°
2043-10-28 Wed	100	—	unknown	20:35–05:20 (good, 8.75 h)	72.6° 01:40	10.35	14%	111.6°
2043-10-29 Thu	100	—	unknown	20:30–05:20 (good, 8.83 h)	72.5° 01:35	10.39	8%	124.1°
2043-10-30 Fri	100	—	unknown	20:25–05:20 (good, 8.92 h)	72.6° 01:35	10.42	3%	136.4°
2043-10-31 Sat	100	—	unknown	20:25–05:20 (good, 8.92 h)	72.6° 01:30	10.46	1%	148.6°
2043-11-01 Sun	100	—	unknown	20:20–05:20 (good, 9.0 h)	72.6° 01:25	10.5	0%	160.6°
2043-11-02 Mon	100	—	unknown	20:15–05:25 (good, 9.17 h)	72.6° 01:20	10.53	1%	172.5°
2043-11-03 Tue	100	—	unknown	20:10–05:25 (good, 9.25 h)	72.5° 01:20	10.57	4%	175.6°
2043-11-04 Wed	100	—	unknown	20:10–05:25 (good, 9.25 h)	72.6° 01:15	10.6	8%	163.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2043-10-06&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.