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 Vega: 03-23 (100), 03-24 (100), 03-25 (100), 03-26 (100), 03-27 (100) — by astronomy; check the weather when the night is within four days.

2036-03-19astronomy score per night — click a bar for that night2036-04-17

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2036-03-19 Wed	68	—	unknown	01:10–04:55 (good, 3.75 h)	87.1° 07:05	8.74	48%	58.4°
2036-03-20 Thu	78	—	unknown	01:10–04:50 (good, 3.67 h)	87.1° 07:00	8.69	39%	58.2°
2036-03-21 Fri	89	—	unknown	01:05–04:50 (good, 3.75 h)	87.1° 07:00	8.64	30%	59.6°
2036-03-22 Sat	96	—	unknown	01:00–04:45 (good, 3.75 h)	87.1° 06:55	8.59	22%	62.3°
2036-03-23 Sun	100	—	unknown	00:55–04:45 (good, 3.83 h)	87.1° 06:50	8.54	14%	66.2°
2036-03-24 Mon	100	—	unknown	00:50–04:45 (good, 3.92 h)	87.1° 06:45	8.48	8%	71.2°
2036-03-25 Tue	100	—	unknown	00:50–04:40 (good, 3.83 h)	87.1° 06:40	8.43	4%	76.9°
2036-03-26 Wed	100	—	unknown	00:45–04:40 (good, 3.92 h)	87.1° 06:40	8.38	1%	83.2°
2036-03-27 Thu	100	—	unknown	00:40–04:40 (good, 4.0 h)	87.1° 06:35	8.32	0%	89.9°
2036-03-28 Fri	100	—	unknown	00:35–04:35 (good, 4.0 h)	87.1° 06:30	8.27	1%	96.7°
2036-03-29 Sat	100	—	unknown	00:30–05:35 (good, 4.08 h)	87.1° 07:25	8.21	5%	103.4°
2036-03-30 Sun	100	—	unknown	01:30–05:30 (good, 4.0 h)	87.1° 07:25	8.16	10%	109.6°
2036-03-31 Mon	100	—	unknown	01:25–05:30 (good, 4.08 h)	87.1° 07:20	8.11	18%	114.9°
2036-04-01 Tue	100	—	unknown	01:20–05:30 (good, 4.17 h)	87.1° 07:15	8.05	27%	119.0°
2036-04-02 Wed	100	—	unknown	01:20–05:25 (good, 4.08 h)	87.1° 07:10	8.0	38%	121.3°
2036-04-03 Thu	100	—	unknown	01:15–05:25 (good, 4.17 h)	87.1° 07:05	7.94	49%	121.7°
2036-04-04 Fri	100	—	unknown	01:15–05:20 (good, 4.08 h)	87.1° 07:05	7.88	61%	119.9°
2036-04-05 Sat	100	—	unknown	01:15–05:20 (good, 4.08 h)	87.1° 07:00	7.83	72%	116.1°
2036-04-06 Sun	100	—	unknown	01:15–05:20 (good, 4.08 h)	87.1° 06:55	7.77	81%	110.8°
2036-04-07 Mon	82	—	unknown	01:20–05:15 (good, 3.92 h)	87.1° 06:50	7.72	89%	104.4°
2036-04-08 Tue	72	—	unknown	01:35–05:15 (good, 3.67 h)	87.1° 06:45	7.66	95%	97.3°
2036-04-09 Wed	63	—	unknown	02:20–05:15 (good, 2.92 h)	87.1° 06:45	7.6	99%	89.9°
2036-04-10 Thu	54	—	unknown	02:55–05:10 (good, 2.25 h)	87.1° 06:40	7.55	100%	82.7°
2036-04-11 Fri	50	—	unknown	03:25–05:10 (good, 1.75 h)	87.1° 06:35	7.49	98%	75.9°
2036-04-12 Sat	47	—	unknown	03:35–05:05 (good, 1.5 h)	87.1° 06:30	7.43	95%	69.9°
2036-04-13 Sun	48	—	unknown	03:15–05:05 (good, 1.83 h)	87.1° 06:30	7.38	89%	65.0°
2036-04-14 Mon	53	—	unknown	02:05–05:05 (good, 3.0 h)	87.1° 06:25	7.32	82%	61.3°
2036-04-15 Tue	66	—	unknown	00:25–05:00 (good, 4.58 h)	87.1° 06:20	7.26	74%	59.0°
2036-04-16 Wed	84	—	unknown	00:20–05:00 (good, 4.67 h)	87.1° 06:15	7.2	66%	58.3°
2036-04-17 Thu	91	—	unknown	00:20–04:55 (good, 4.58 h)	87.1° 06:10	7.14	56%	59.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-03-19&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.