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: 10-15 (100), 10-16 (100), 10-17 (100), 10-18 (100), 10-29 (100) — by astronomy; check the weather when the night is within four days.

2034-10-15astronomy score per night — click a bar for that night2034-11-13

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-10-15 Sun	100	—	unknown	20:15–03:05 (good, 6.83 h)	87.3° 20:45	9.82	12%	89.8°
2034-10-16 Mon	100	—	unknown	20:15–03:00 (good, 6.75 h)	87.3° 20:40	9.87	18%	83.2°
2034-10-17 Tue	100	—	unknown	20:10–02:55 (good, 6.75 h)	87.3° 20:35	9.91	26%	76.8°
2034-10-18 Wed	100	—	unknown	20:10–02:50 (good, 6.67 h)	87.3° 20:30	9.95	35%	70.8°
2034-10-19 Thu	97	—	unknown	20:10–02:50 (good, 6.67 h)	87.3° 20:30	9.99	44%	65.3°
2034-10-20 Fri	90	—	unknown	20:05–02:45 (good, 6.67 h)	87.3° 20:25	10.04	54%	60.8°
2034-10-21 Sat	83	—	unknown	20:05–02:40 (good, 6.58 h)	87.3° 20:20	10.08	64%	57.5°
2034-10-22 Sun	65	—	unknown	20:05–02:00 (good, 5.92 h)	87.3° 20:15	10.12	74%	55.9°
2034-10-23 Mon	60	—	unknown	20:05–20:10 (good, 0.08 h)	87.3° 20:10	10.16	83%	56.4°
2034-10-24 Tue	56	—	unknown	20:00–02:50 (marginal, 6.83 h)	87.3° 20:10	10.2	90%	59.1°
2034-10-25 Wed	55	—	unknown	20:00–20:15 (good, 0.25 h)	87.3° 20:05	10.24	96%	63.8°
2034-10-26 Thu	61	—	unknown	20:00–21:20 (good, 1.33 h)	87.3° 20:00	10.28	99%	70.3°
2034-10-27 Fri	72	—	unknown	20:00–23:00 (good, 3.0 h)	87.3° 19:55	10.32	100%	78.0°
2034-10-28 Sat	79	—	unknown	19:55–00:00 (good, 4.08 h)	87.3° 19:55	10.35	97%	86.3°
2034-10-29 Sun	100	—	unknown	18:55–00:10 (good, 5.25 h)	87.3° 18:50	10.39	91%	94.7°
2034-10-30 Mon	100	—	unknown	18:55–00:40 (good, 5.75 h)	87.3° 18:45	10.43	84%	102.8°
2034-10-31 Tue	100	—	unknown	18:55–00:45 (good, 5.83 h)	87.3° 18:40	10.47	74%	110.1°
2034-11-01 Wed	100	—	unknown	18:50–00:45 (good, 5.92 h)	87.3° 18:35	10.5	63%	116.2°
2034-11-02 Thu	100	—	unknown	18:50–00:45 (good, 5.92 h)	87.3° 18:35	10.54	52%	120.7°
2034-11-03 Fri	100	—	unknown	18:50–00:45 (good, 5.92 h)	87.3° 18:30	10.58	42%	123.4°
2034-11-04 Sat	100	—	unknown	18:50–00:45 (good, 5.92 h)	87.3° 18:25	10.61	32%	124.1°
2034-11-05 Sun	100	—	unknown	18:50–00:40 (good, 5.83 h)	87.3° 18:20	10.64	23%	122.8°
2034-11-06 Mon	100	—	unknown	18:45–00:35 (good, 5.83 h)	87.3° 18:15	10.68	15%	119.9°
2034-11-07 Tue	100	—	unknown	18:45–00:35 (good, 5.83 h)	87.3° 18:15	10.71	9%	115.7°
2034-11-08 Wed	100	—	unknown	18:45–00:30 (good, 5.75 h)	87.3° 18:10	10.75	4%	110.5°
2034-11-09 Thu	100	—	unknown	18:45–00:25 (good, 5.67 h)	87.3° 18:05	10.78	1%	104.6°
2034-11-10 Fri	100	—	unknown	18:45–00:20 (good, 5.58 h)	87.3° 18:00	10.81	0%	98.2°
2034-11-11 Sat	100	—	unknown	18:45–00:20 (good, 5.58 h)	87.3° 18:00	10.84	1%	91.6°
2034-11-12 Sun	100	—	unknown	18:40–00:15 (good, 5.58 h)	87.3° 17:55	10.87	3%	85.0°
2034-11-13 Mon	100	—	unknown	18:40–00:10 (good, 5.5 h)	87.3° 17:50	10.9	7%	78.6°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-10-15&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.