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 North America Nebula: 06-02 (100), 06-03 (100), 06-04 (100), 06-05 (100), 06-06 (100) — by astronomy; check the weather when the night is within four days.

2032-05-19astronomy score per night — click a bar for that night2032-06-17

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-05-19 Wed	97	—	unknown	00:20–04:00 (good, 3.67 h)	87.2° 06:30	5.34	73%	124.2°
2032-05-20 Thu	97	—	unknown	00:20–04:00 (good, 3.67 h)	87.2° 06:25	5.29	82%	120.2°
2032-05-21 Fri	85	—	unknown	00:20–03:55 (good, 3.58 h)	87.2° 06:20	5.24	89%	114.7°
2032-05-22 Sat	78	—	unknown	00:25–03:55 (good, 3.5 h)	87.2° 06:15	5.2	94%	108.0°
2032-05-23 Sun	70	—	unknown	00:25–03:55 (good, 3.5 h)	87.2° 06:10	5.15	98%	100.4°
2032-05-24 Mon	62	—	unknown	00:40–03:55 (good, 3.25 h)	87.2° 06:10	5.1	100%	92.3°
2032-05-25 Tue	54	—	unknown	01:15–03:50 (good, 2.58 h)	87.2° 06:05	5.06	99%	83.9°
2032-05-26 Wed	50	—	unknown	01:40–03:50 (good, 2.17 h)	87.2° 06:00	5.01	96%	75.7°
2032-05-27 Thu	49	—	unknown	01:30–03:50 (good, 2.33 h)	87.2° 05:55	4.97	90%	67.9°
2032-05-28 Fri	57	—	unknown	00:10–03:50 (good, 3.67 h)	87.2° 05:50	4.93	82%	61.2°
2032-05-29 Sat	74	—	unknown	23:35–03:50 (good, 4.25 h)	87.2° 05:50	4.89	72%	56.2°
2032-05-30 Sun	84	—	unknown	23:30–03:45 (good, 4.25 h)	87.2° 05:45	4.85	61%	53.4°
2032-05-31 Mon	91	—	unknown	23:25–03:45 (good, 4.33 h)	87.2° 05:40	4.81	49%	53.1°
2032-06-01 Tue	96	—	unknown	23:20–03:45 (good, 4.42 h)	87.2° 05:35	4.78	38%	55.4°
2032-06-02 Wed	100	—	unknown	23:15–03:45 (good, 4.5 h)	87.2° 05:35	4.74	28%	59.9°
2032-06-03 Thu	100	—	unknown	23:15–03:45 (good, 4.5 h)	87.2° 05:30	4.71	18%	65.9°
2032-06-04 Fri	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.2° 05:25	4.68	11%	73.0°
2032-06-05 Sat	100	—	unknown	23:05–03:40 (good, 4.58 h)	87.2° 05:20	4.65	5%	80.6°
2032-06-06 Sun	100	—	unknown	23:05–03:40 (good, 4.58 h)	87.2° 05:15	4.62	1%	88.4°
2032-06-07 Mon	100	—	unknown	23:05–03:40 (good, 4.58 h)	87.2° 05:15	4.59	0%	96.2°
2032-06-08 Tue	100	—	unknown	23:05–03:40 (good, 4.58 h)	87.2° 05:10	4.57	1%	103.6°
2032-06-09 Wed	100	—	unknown	23:05–03:40 (good, 4.58 h)	87.2° 05:05	4.54	4%	110.4°
2032-06-10 Thu	100	—	unknown	23:05–03:40 (good, 4.58 h)	87.2° 05:00	4.52	8%	116.4°
2032-06-11 Fri	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.2° 04:55	4.5	14%	121.3°
2032-06-12 Sat	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.2° 04:55	4.49	22%	124.8°
2032-06-13 Sun	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.2° 04:50	4.47	30%	126.7°
2032-06-14 Mon	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.2° 04:45	4.46	39%	126.8°
2032-06-15 Tue	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.2° 04:40	4.45	48%	125.1°
2032-06-16 Wed	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.2° 04:40	4.44	58%	121.6°
2032-06-17 Thu	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.2° 04:35	4.43	67%	116.7°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-05-19&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.