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: 04-12 (62), 04-11 (61), 04-10 (60), 04-09 (59), 04-08 (55) — by astronomy; check the weather when the night is within four days.

2029-03-14astronomy score per night — click a bar for that night2029-04-12

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2029-03-14 Wed	38	—	unknown	03:35–05:05 (good, 1.5 h)	87.3° 09:50	9.01	0%	53.6°
2029-03-15 Thu	38	—	unknown	03:30–05:00 (good, 1.5 h)	87.3° 09:45	8.96	1%	55.9°
2029-03-16 Fri	40	—	unknown	03:25–05:00 (good, 1.58 h)	87.3° 09:40	8.91	3%	59.6°
2029-03-17 Sat	40	—	unknown	03:20–04:55 (good, 1.58 h)	87.3° 09:35	8.86	7%	64.6°
2029-03-18 Sun	41	—	unknown	03:20–04:55 (good, 1.58 h)	87.3° 09:30	8.81	12%	70.6°
2029-03-19 Mon	42	—	unknown	03:15–04:55 (good, 1.67 h)	87.3° 09:30	8.76	19%	77.2°
2029-03-20 Tue	42	—	unknown	03:10–04:50 (good, 1.67 h)	87.3° 09:25	8.71	27%	84.2°
2029-03-21 Wed	44	—	unknown	03:05–04:50 (good, 1.75 h)	87.3° 09:20	8.66	36%	91.6°
2029-03-22 Thu	45	—	unknown	03:00–04:50 (good, 1.83 h)	87.3° 09:15	8.6	46%	99.0°
2029-03-23 Fri	44	—	unknown	03:00–04:45 (good, 1.75 h)	87.3° 09:15	8.55	56%	106.4°
2029-03-24 Sat	45	—	unknown	04:00–05:45 (good, 1.75 h)	87.3° 10:10	8.5	67%	113.4°
2029-03-25 Sun	45	—	unknown	04:00–05:40 (good, 1.67 h)	87.3° 10:05	8.45	77%	119.6°
2029-03-26 Mon	45	—	unknown	03:55–05:40 (good, 1.75 h)	87.3° 10:00	8.39	86%	124.3°
2029-03-27 Tue	41	—	unknown	03:55–05:40 (good, 1.75 h)	87.3° 09:55	8.34	93%	126.8°
2029-03-28 Wed	40	—	unknown	03:50–05:35 (good, 1.75 h)	87.3° 09:55	8.28	98%	126.4°
2029-03-29 Thu	40	—	unknown	03:50–05:35 (good, 1.75 h)	87.3° 09:50	8.23	100%	123.2°
2029-03-30 Fri	40	—	unknown	03:45–05:35 (good, 1.83 h)	87.3° 09:45	8.18	99%	117.6°
2029-03-31 Sat	37	—	unknown	03:45–05:30 (good, 1.75 h)	87.3° 09:40	8.12	95%	110.3°
2029-04-01 Sun	36	—	unknown	03:45–05:30 (good, 1.75 h)	87.3° 09:35	8.07	88%	102.1°
2029-04-02 Mon	34	—	unknown	03:40–05:25 (good, 1.75 h)	87.3° 09:35	8.01	80%	93.5°
2029-04-03 Tue	35	—	unknown	03:35–05:25 (good, 1.83 h)	87.3° 09:30	7.96	70%	85.1°
2029-04-04 Wed	38	—	unknown	03:30–05:25 (good, 1.92 h)	87.3° 09:25	7.9	59%	77.1°
2029-04-05 Thu	41	—	unknown	03:20–05:20 (good, 2.0 h)	87.3° 09:20	7.85	49%	69.8°
2029-04-06 Fri	46	—	unknown	03:05–05:20 (good, 2.25 h)	87.3° 09:20	7.79	39%	63.6°
2029-04-07 Sat	50	—	unknown	03:00–05:15 (good, 2.25 h)	87.3° 09:15	7.73	29%	58.5°
2029-04-08 Sun	55	—	unknown	02:55–05:15 (good, 2.33 h)	87.3° 09:10	7.68	21%	55.0°
2029-04-09 Mon	59	—	unknown	02:50–05:15 (good, 2.42 h)	87.3° 09:05	7.62	14%	53.2°
2029-04-10 Tue	60	—	unknown	02:45–05:10 (good, 2.42 h)	87.3° 09:00	7.56	8%	53.2°
2029-04-11 Wed	61	—	unknown	02:45–05:10 (good, 2.42 h)	87.3° 09:00	7.51	4%	55.1°
2029-04-12 Thu	62	—	unknown	02:40–05:05 (good, 2.42 h)	87.3° 08:55	7.45	1%	58.6°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2029-03-14&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.