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: 04-09 (100), 04-10 (100), 04-11 (100), 04-12 (100), 04-13 (100) — by astronomy; check the weather when the night is within four days.

2032-04-09astronomy score per night — click a bar for that night2032-05-08

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-04-09 Fri	100	—	unknown	00:50–05:15 (good, 4.42 h)	87.1° 06:45	7.61	0%	89.7°
2032-04-10 Sat	100	—	unknown	00:45–05:10 (good, 4.42 h)	87.1° 06:40	7.55	1%	97.4°
2032-04-11 Sun	100	—	unknown	00:40–05:10 (good, 4.5 h)	87.1° 06:35	7.49	4%	104.6°
2032-04-12 Mon	100	—	unknown	00:35–05:05 (good, 4.5 h)	87.1° 06:30	7.43	10%	110.9°
2032-04-13 Tue	100	—	unknown	00:35–05:05 (good, 4.5 h)	87.1° 06:30	7.38	16%	116.2°
2032-04-14 Wed	100	—	unknown	00:30–05:05 (good, 4.58 h)	87.1° 06:25	7.32	25%	120.1°
2032-04-15 Thu	100	—	unknown	00:30–05:00 (good, 4.5 h)	87.1° 06:20	7.26	34%	122.4°
2032-04-16 Fri	100	—	unknown	00:25–05:00 (good, 4.58 h)	87.1° 06:15	7.2	43%	123.1°
2032-04-17 Sat	100	—	unknown	00:25–04:55 (good, 4.5 h)	87.1° 06:10	7.15	53%	122.2°
2032-04-18 Sun	100	—	unknown	00:20–04:55 (good, 4.58 h)	87.1° 06:10	7.09	62%	119.8°
2032-04-19 Mon	100	—	unknown	00:20–04:55 (good, 4.58 h)	87.1° 06:05	7.03	71%	116.0°
2032-04-20 Tue	100	—	unknown	00:20–04:50 (good, 4.5 h)	87.1° 06:00	6.97	79%	111.2°
2032-04-21 Wed	100	—	unknown	00:25–04:50 (good, 4.42 h)	87.1° 05:55	6.91	86%	105.6°
2032-04-22 Thu	85	—	unknown	00:25–04:45 (good, 4.33 h)	87.1° 05:50	6.86	92%	99.3°
2032-04-23 Fri	77	—	unknown	00:55–04:45 (good, 3.83 h)	87.1° 05:50	6.8	97%	92.6°
2032-04-24 Sat	68	—	unknown	01:30–04:45 (good, 3.25 h)	87.1° 05:45	6.74	100%	85.6°
2032-04-25 Sun	60	—	unknown	02:00–04:40 (good, 2.67 h)	87.1° 05:40	6.68	100%	78.6°
2032-04-26 Mon	55	—	unknown	02:20–04:40 (good, 2.33 h)	87.1° 05:35	6.62	98%	72.0°
2032-04-27 Tue	53	—	unknown	02:20–04:40 (good, 2.33 h)	87.1° 05:35	6.56	94%	66.0°
2032-04-28 Wed	56	—	unknown	01:20–04:35 (good, 3.25 h)	87.1° 05:30	6.51	88%	61.2°
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°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-04-09&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.