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: 05-03 (100), 05-04 (100), 05-05 (100), 05-06 (100), 05-07 (100) — by astronomy; check the weather when the night is within four days.

2032-04-29astronomy score per night — click a bar for that night2032-05-28

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-04-29 Thu	81	—	unknown	23:30–04:35 (good, 5.08 h)	87.1° 05:25	6.45	79%	58.0°
2032-04-30 Fri	88	—	unknown	23:25–04:30 (good, 5.08 h)	87.1° 05:20	6.39	69%	56.9°
2032-05-01 Sat	94	—	unknown	23:25–04:30 (good, 5.08 h)	87.1° 05:15	6.33	58%	57.9°
2032-05-02 Sun	99	—	unknown	23:20–04:30 (good, 5.17 h)	87.1° 05:15	6.27	47%	61.1°
2032-05-03 Mon	100	—	unknown	23:15–04:25 (good, 5.17 h)	87.1° 05:10	6.22	36%	66.0°
2032-05-04 Tue	100	—	unknown	23:10–04:25 (good, 5.25 h)	87.1° 05:05	6.16	25%	72.3°
2032-05-05 Wed	100	—	unknown	23:05–04:25 (good, 5.33 h)	87.1° 05:00	6.1	16%	79.4°
2032-05-06 Thu	100	—	unknown	23:05–04:20 (good, 5.25 h)	87.1° 04:55	6.04	8%	86.9°
2032-05-07 Fri	100	—	unknown	23:00–04:20 (good, 5.33 h)	87.1° 04:55	5.99	3%	94.6°
2032-05-08 Sat	100	—	unknown	22:55–04:20 (good, 5.42 h)	87.1° 04:50	5.93	0%	101.9°
2032-05-09 Sun	100	—	unknown	22:50–04:15 (good, 5.42 h)	87.1° 04:45	5.88	0%	108.6°
2032-05-10 Mon	100	—	unknown	22:45–04:15 (good, 5.5 h)	87.1° 04:40	5.82	2%	114.3°
2032-05-11 Tue	100	—	unknown	22:45–04:15 (good, 5.5 h)	87.1° 04:40	5.76	6%	118.8°
2032-05-12 Wed	100	—	unknown	22:40–04:10 (good, 5.5 h)	87.1° 04:35	5.71	12%	121.8°
2032-05-13 Thu	100	—	unknown	22:35–04:10 (good, 5.58 h)	87.1° 04:30	5.66	19%	123.1°
2032-05-14 Fri	100	—	unknown	22:35–04:10 (good, 5.58 h)	87.1° 04:25	5.6	27%	122.7°
2032-05-15 Sat	100	—	unknown	22:35–04:05 (good, 5.5 h)	87.1° 04:20	5.55	36%	120.7°
2032-05-16 Sun	100	—	unknown	22:35–04:05 (good, 5.5 h)	87.1° 04:20	5.5	46%	117.4°
2032-05-17 Mon	100	—	unknown	22:35–04:05 (good, 5.5 h)	87.1° 04:15	5.44	55%	113.0°
2032-05-18 Tue	100	—	unknown	22:40–04:00 (good, 5.33 h)	87.1° 04:10	5.39	64%	107.6°
2032-05-19 Wed	100	—	unknown	22:40–04:00 (good, 5.33 h)	87.1° 04:05	5.34	73%	101.6°
2032-05-20 Thu	100	—	unknown	22:40–04:00 (good, 5.33 h)	87.1° 04:00	5.29	82%	95.0°
2032-05-21 Fri	82	—	unknown	23:00–03:55 (good, 4.92 h)	87.1° 04:00	5.24	89%	88.1°
2032-05-22 Sat	77	—	unknown	23:45–03:55 (good, 4.17 h)	87.1° 03:55	5.2	94%	81.1°
2032-05-23 Sun	67	—	unknown	00:25–03:55 (good, 3.5 h)	87.1° 03:50	5.15	98%	74.3°
2032-05-24 Mon	59	—	unknown	01:00–03:55 (good, 2.92 h)	87.1° 03:45	5.1	100%	68.0°
2032-05-25 Tue	52	—	unknown	03:35–03:50 (good, 0.25 h)	87.1° 03:40	5.06	99%	62.6°
2032-05-26 Wed	54	—	unknown	00:35–01:25 (good, 0.83 h)	87.1° 03:40	5.01	96%	58.8°
2032-05-27 Thu	84	—	unknown	22:50–03:00 (good, 4.17 h)	87.1° 03:35	4.97	90%	57.0°
2032-05-28 Fri	92	—	unknown	22:55–03:50 (good, 4.92 h)	87.1° 03:30	4.93	82%	57.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-04-29&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.