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 V1057 Cyg: 10-18 (100), 10-19 (100), 10-20 (100), 10-21 (100), 10-22 (100) — by astronomy; check the weather when the night is within four days.

2036-10-18astronomy score per night — click a bar for that night2036-11-16

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2036-10-18 Sat	100	—	unknown	20:10–02:50 (good, 6.67 h)	87.3° 20:30	9.97	1%	110.5°
2036-10-19 Sun	100	—	unknown	20:10–02:45 (good, 6.58 h)	87.3° 20:25	10.02	0%	104.4°
2036-10-20 Mon	100	—	unknown	20:05–02:40 (good, 6.58 h)	87.3° 20:20	10.06	3%	97.7°
2036-10-21 Tue	100	—	unknown	20:05–02:40 (good, 6.58 h)	87.3° 20:20	10.1	7%	90.9°
2036-10-22 Wed	100	—	unknown	20:05–02:35 (good, 6.5 h)	87.3° 20:15	10.14	14%	84.2°
2036-10-23 Thu	100	—	unknown	20:05–02:30 (good, 6.42 h)	87.3° 20:10	10.18	21%	77.9°
2036-10-24 Fri	100	—	unknown	20:00–02:25 (good, 6.42 h)	87.3° 20:05	10.22	30%	72.3°
2036-10-25 Sat	98	—	unknown	20:00–02:20 (good, 6.33 h)	87.3° 20:05	10.26	39%	67.4°
2036-10-26 Sun	91	—	unknown	19:00–01:20 (good, 6.33 h)	87.3° 19:00	10.3	49%	63.6°
2036-10-27 Mon	85	—	unknown	18:55–01:15 (good, 6.33 h)	87.3° 18:55	10.34	58%	60.9°
2036-10-28 Tue	71	—	unknown	18:55–00:45 (good, 5.83 h)	87.3° 18:50	10.37	67%	59.5°
2036-10-29 Wed	66	—	unknown	18:55–23:30 (good, 4.58 h)	87.3° 18:45	10.41	76%	59.6°
2036-10-30 Thu	62	—	unknown	18:55–21:35 (good, 2.67 h)	87.3° 18:45	10.45	83%	61.1°
2036-10-31 Fri	58	—	unknown	18:55–19:45 (good, 0.83 h)	87.3° 18:40	10.49	90%	64.0°
2036-11-01 Sat	58	—	unknown	18:50–20:00 (good, 1.17 h)	87.3° 18:35	10.52	95%	68.1°
2036-11-02 Sun	62	—	unknown	18:50–20:50 (good, 2.0 h)	87.3° 18:30	10.56	98%	73.4°
2036-11-03 Mon	70	—	unknown	18:50–21:40 (good, 2.83 h)	87.3° 18:25	10.59	100%	79.4°
2036-11-04 Tue	77	—	unknown	18:50–22:25 (good, 3.58 h)	87.3° 18:25	10.63	99%	86.0°
2036-11-05 Wed	83	—	unknown	18:45–23:15 (good, 4.5 h)	87.3° 18:20	10.66	96%	92.8°
2036-11-06 Thu	100	—	unknown	18:45–00:05 (good, 5.33 h)	87.3° 18:15	10.7	90%	99.7°
2036-11-07 Fri	100	—	unknown	18:45–00:10 (good, 5.42 h)	87.3° 18:10	10.73	83%	106.2°
2036-11-08 Sat	100	—	unknown	18:45–00:15 (good, 5.5 h)	87.3° 18:10	10.76	73%	111.9°
2036-11-09 Sun	100	—	unknown	18:45–00:15 (good, 5.5 h)	87.3° 18:05	10.79	63%	116.5°
2036-11-10 Mon	100	—	unknown	18:45–00:15 (good, 5.5 h)	87.3° 18:00	10.83	52%	119.4°
2036-11-11 Tue	100	—	unknown	18:40–00:15 (good, 5.58 h)	87.3° 17:55	10.86	40%	120.5°
2036-11-12 Wed	100	—	unknown	18:40–00:10 (good, 5.5 h)	87.3° 17:50	10.89	29%	119.6°
2036-11-13 Thu	100	—	unknown	18:40–00:10 (good, 5.5 h)	87.3° 17:50	10.92	20%	116.7°
2036-11-14 Fri	100	—	unknown	18:40–00:05 (good, 5.42 h)	87.3° 17:45	10.95	12%	112.3°
2036-11-15 Sat	100	—	unknown	18:40–00:00 (good, 5.33 h)	87.3° 17:40	10.98	5%	106.6°
2036-11-16 Sun	100	—	unknown	18:40–23:55 (good, 5.25 h)	87.3° 17:35	11.0	2%	100.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-10-18&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.