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: 04-03 (55), 04-06 (55), 04-01 (54), 04-04 (54), 04-05 (54) — by astronomy; check the weather when the night is within four days.

2036-03-08astronomy score per night — click a bar for that night2036-04-06

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2036-03-08 Sat	32	—	unknown	04:05–05:15 (good, 1.17 h)	87.3° 10:10	9.29	84%	117.3°
2036-03-09 Sun	29	—	unknown	04:00–05:10 (good, 1.17 h)	87.3° 10:05	9.24	92%	120.6°
2036-03-10 Mon	28	—	unknown	04:00–05:10 (good, 1.17 h)	87.3° 10:05	9.2	97%	121.7°
2036-03-11 Tue	28	—	unknown	04:00–05:05 (good, 1.08 h)	87.3° 10:00	9.15	100%	120.5°
2036-03-12 Wed	28	—	unknown	03:55–05:05 (good, 1.17 h)	87.3° 09:55	9.1	100%	117.3°
2036-03-13 Thu	27	—	unknown	03:55–05:05 (good, 1.17 h)	87.3° 09:50	9.05	97%	112.4°
2036-03-14 Fri	25	—	unknown	03:55–05:00 (good, 1.08 h)	87.3° 09:45	9.0	92%	106.5°
2036-03-15 Sat	25	—	unknown	03:55–05:00 (good, 1.08 h)	87.3° 09:45	8.95	85%	100.1°
2036-03-16 Sun	25	—	unknown	03:50–05:00 (good, 1.17 h)	87.3° 09:40	8.9	77%	93.4°
2036-03-17 Mon	26	—	unknown	03:45–04:55 (good, 1.17 h)	87.3° 09:35	8.85	68%	86.8°
2036-03-18 Tue	28	—	unknown	03:40–04:55 (good, 1.25 h)	87.3° 09:30	8.8	58%	80.5°
2036-03-19 Wed	30	—	unknown	03:30–04:55 (good, 1.42 h)	87.3° 09:30	8.74	48%	74.6°
2036-03-20 Thu	32	—	unknown	03:20–04:50 (good, 1.5 h)	87.3° 09:25	8.69	39%	69.3°
2036-03-21 Fri	37	—	unknown	03:05–04:50 (good, 1.75 h)	87.3° 09:20	8.64	30%	64.8°
2036-03-22 Sat	41	—	unknown	03:00–04:45 (good, 1.75 h)	87.3° 09:15	8.59	22%	61.3°
2036-03-23 Sun	45	—	unknown	02:55–04:45 (good, 1.83 h)	87.3° 09:10	8.54	14%	59.1°
2036-03-24 Mon	46	—	unknown	02:55–04:45 (good, 1.83 h)	87.3° 09:10	8.48	8%	58.3°
2036-03-25 Tue	46	—	unknown	02:50–04:40 (good, 1.83 h)	87.3° 09:05	8.43	4%	59.1°
2036-03-26 Wed	48	—	unknown	02:45–04:40 (good, 1.92 h)	87.3° 09:00	8.38	1%	61.5°
2036-03-27 Thu	49	—	unknown	02:40–04:40 (good, 2.0 h)	87.3° 08:55	8.32	0%	65.3°
2036-03-28 Fri	50	—	unknown	02:35–04:35 (good, 2.0 h)	87.3° 08:50	8.27	1%	70.4°
2036-03-29 Sat	50	—	unknown	02:35–05:35 (good, 2.0 h)	87.3° 09:50	8.21	5%	76.5°
2036-03-30 Sun	50	—	unknown	03:30–05:30 (good, 2.0 h)	87.3° 09:45	8.16	10%	83.2°
2036-03-31 Mon	52	—	unknown	03:25–05:30 (good, 2.08 h)	87.3° 09:40	8.11	18%	90.3°
2036-04-01 Tue	54	—	unknown	03:20–05:30 (good, 2.17 h)	87.3° 09:35	8.05	27%	97.5°
2036-04-02 Wed	53	—	unknown	03:20–05:25 (good, 2.08 h)	87.3° 09:35	8.0	38%	104.4°
2036-04-03 Thu	55	—	unknown	03:15–05:25 (good, 2.17 h)	87.3° 09:30	7.94	49%	110.7°
2036-04-04 Fri	54	—	unknown	03:15–05:20 (good, 2.08 h)	87.3° 09:25	7.88	61%	116.0°
2036-04-05 Sat	54	—	unknown	03:15–05:20 (good, 2.08 h)	87.3° 09:20	7.83	72%	119.7°
2036-04-06 Sun	55	—	unknown	03:10–05:20 (good, 2.17 h)	87.3° 09:15	7.77	81%	121.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-03-08&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.