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: 09-29 (100), 09-30 (100), 10-01 (100), 10-02 (100), 10-03 (100) — by astronomy; check the weather when the night is within four days.

2032-09-18astronomy score per night — click a bar for that night2032-10-17

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-09-18 Sat	57	—	unknown	03:35–05:35 (good, 2.0 h)	72.6° 05:15	8.56	100%	69.8°
2032-09-19 Sun	37	—	unknown	00:10–05:35 (marginal, 5.42 h)	72.6° 05:10	8.61	100%	54.8°
2032-09-20 Mon	23	—	unknown	00:25–05:35 (marginal, 5.17 h)	72.6° 05:10	8.66	97%	40.1°
2032-09-21 Tue	18	—	unknown	00:15–05:40 (marginal, 5.42 h)	72.6° 05:05	8.71	91%	25.8°
2032-09-22 Wed	24	—	unknown	23:50–05:40 (marginal, 5.83 h)	72.6° 05:00	8.76	83%	12.7°
2032-09-23 Thu	35	—	unknown	23:35–05:40 (marginal, 6.08 h)	72.6° 04:55	8.81	74%	7.3°
2032-09-24 Fri	50	—	unknown	23:20–05:40 (marginal, 6.33 h)	72.6° 04:50	8.86	65%	17.3°
2032-09-25 Sat	66	—	unknown	00:05–05:10 (good, 5.08 h)	72.6° 04:50	8.91	55%	29.5°
2032-09-26 Sun	84	—	unknown	23:40–05:45 (good, 6.08 h)	72.6° 04:45	8.96	45%	41.7°
2032-09-27 Mon	91	—	unknown	23:35–05:45 (good, 6.17 h)	72.6° 04:40	9.01	35%	53.7°
2032-09-28 Tue	98	—	unknown	23:30–05:45 (good, 6.25 h)	72.6° 04:35	9.06	26%	65.5°
2032-09-29 Wed	100	—	unknown	23:25–05:45 (good, 6.33 h)	72.6° 04:30	9.11	18%	77.3°
2032-09-30 Thu	100	—	unknown	23:20–05:50 (good, 6.5 h)	72.6° 04:30	9.16	12%	89.0°
2032-10-01 Fri	100	—	unknown	23:20–05:50 (good, 6.5 h)	72.6° 04:25	9.21	6%	100.8°
2032-10-02 Sat	100	—	unknown	23:15–05:50 (good, 6.58 h)	72.6° 04:20	9.25	2%	112.6°
2032-10-03 Sun	100	—	unknown	23:10–05:50 (good, 6.67 h)	72.6° 04:15	9.3	0%	124.4°
2032-10-04 Mon	100	—	unknown	23:05–05:55 (good, 6.83 h)	72.6° 04:15	9.35	0%	136.4°
2032-10-05 Tue	100	—	unknown	23:05–05:55 (good, 6.83 h)	72.6° 04:10	9.39	2%	148.4°
2032-10-06 Wed	100	—	unknown	23:00–05:55 (good, 6.92 h)	72.6° 04:05	9.44	5%	160.4°
2032-10-07 Thu	100	—	unknown	22:55–05:55 (good, 7.0 h)	72.6° 04:00	9.49	11%	171.1°
2032-10-08 Fri	100	—	unknown	22:50–05:55 (good, 7.08 h)	72.6° 03:55	9.53	18%	170.4°
2032-10-09 Sat	100	—	unknown	22:45–06:00 (good, 7.25 h)	72.6° 03:55	9.58	27%	159.0°
2032-10-10 Sun	100	—	unknown	22:45–06:00 (good, 7.25 h)	72.6° 03:50	9.62	37%	146.2°
2032-10-11 Mon	100	—	unknown	22:45–06:00 (good, 7.25 h)	72.6° 03:45	9.67	47%	132.8°
2032-10-12 Tue	100	—	unknown	22:40–06:00 (good, 7.33 h)	72.6° 03:40	9.71	59%	119.1°
2032-10-13 Wed	100	—	unknown	22:45–06:05 (good, 7.33 h)	72.6° 03:35	9.76	70%	105.0°
2032-10-14 Thu	100	—	unknown	22:50–06:05 (good, 7.25 h)	72.6° 03:35	9.8	80%	90.7°
2032-10-15 Fri	100	—	unknown	00:15–06:05 (good, 5.83 h)	72.6° 03:30	9.84	88%	76.1°
2032-10-16 Sat	97	—	unknown	03:05–06:05 (good, 3.0 h)	72.6° 03:25	9.89	95%	61.4°
2032-10-17 Sun	53	—	unknown	22:30–06:05 (marginal, 7.58 h)	72.6° 03:20	9.93	99%	46.7°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-09-18&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.