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: 08-13 (100), 08-14 (100), 08-15 (100), 08-16 (100), 08-17 (100) — by astronomy; check the weather when the night is within four days.

2032-08-13astronomy score per night — click a bar for that night2032-09-11

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-08-13 Fri	100	—	unknown	22:10–04:45 (good, 6.58 h)	87.2° 00:50	6.56	46%	100.8°
2032-08-14 Sat	100	—	unknown	22:10–04:45 (good, 6.58 h)	87.2° 00:45	6.62	56%	93.2°
2032-08-15 Sun	100	—	unknown	22:10–04:50 (good, 6.67 h)	87.2° 00:40	6.67	67%	85.2°
2032-08-16 Mon	100	—	unknown	22:05–04:50 (good, 6.75 h)	87.2° 00:40	6.73	77%	77.2°
2032-08-17 Tue	100	—	unknown	22:05–04:50 (good, 6.75 h)	87.2° 00:35	6.79	86%	69.4°
2032-08-18 Wed	92	—	unknown	23:50–04:55 (good, 5.08 h)	87.2° 00:30	6.85	93%	62.4°
2032-08-19 Thu	59	—	unknown	22:00–04:55 (marginal, 6.92 h)	87.2° 00:25	6.9	98%	57.0°
2032-08-20 Fri	56	—	unknown	22:00–04:55 (marginal, 6.92 h)	87.2° 00:20	6.96	100%	53.9°
2032-08-21 Sat	58	—	unknown	21:55–04:55 (marginal, 7.0 h)	87.2° 00:20	7.02	99%	53.6°
2032-08-22 Sun	65	—	unknown	21:55–22:55 (good, 1.0 h)	87.2° 00:15	7.08	95%	56.2°
2032-08-23 Mon	73	—	unknown	21:50–00:45 (good, 2.92 h)	87.2° 00:10	7.13	88%	61.2°
2032-08-24 Tue	100	—	unknown	21:50–03:20 (good, 5.5 h)	87.2° 00:05	7.19	80%	67.8°
2032-08-25 Wed	100	—	unknown	21:50–04:45 (good, 6.92 h)	87.2° 00:00	7.25	70%	75.3°
2032-08-26 Thu	100	—	unknown	21:45–05:05 (good, 7.33 h)	87.2° 00:00	7.3	59%	83.1°
2032-08-27 Fri	100	—	unknown	21:45–05:05 (good, 7.33 h)	87.2° 23:55	7.36	49%	90.9°
2032-08-28 Sat	100	—	unknown	21:40–05:05 (good, 7.42 h)	87.2° 23:50	7.42	39%	98.4°
2032-08-29 Sun	100	—	unknown	21:40–05:10 (good, 7.5 h)	87.2° 23:45	7.47	29%	105.5°
2032-08-30 Mon	100	—	unknown	21:40–05:10 (good, 7.5 h)	87.2° 23:45	7.53	21%	112.0°
2032-08-31 Tue	100	—	unknown	21:35–05:10 (good, 7.58 h)	87.2° 23:40	7.59	14%	117.6°
2032-09-01 Wed	100	—	unknown	21:35–05:15 (good, 7.67 h)	87.2° 23:35	7.64	8%	122.1°
2032-09-02 Thu	100	—	unknown	21:30–05:15 (good, 7.75 h)	87.2° 23:30	7.7	4%	125.2°
2032-09-03 Fri	100	—	unknown	21:30–05:15 (good, 7.75 h)	87.2° 23:25	7.75	1%	126.6°
2032-09-04 Sat	100	—	unknown	21:30–05:15 (good, 7.75 h)	87.2° 23:25	7.81	0%	126.2°
2032-09-05 Sun	100	—	unknown	21:25–05:20 (good, 7.92 h)	87.2° 23:20	7.86	1%	124.1°
2032-09-06 Mon	100	—	unknown	21:25–05:20 (good, 7.92 h)	87.2° 23:15	7.92	4%	120.3°
2032-09-07 Tue	100	—	unknown	21:20–05:20 (good, 8.0 h)	87.2° 23:10	7.97	8%	115.3°
2032-09-08 Wed	100	—	unknown	21:20–05:20 (good, 8.0 h)	87.2° 23:05	8.03	14%	109.3°
2032-09-09 Thu	100	—	unknown	21:20–05:25 (good, 8.08 h)	87.2° 23:05	8.08	22%	102.4°
2032-09-10 Fri	100	—	unknown	21:15–05:20 (good, 8.08 h)	87.2° 23:00	8.14	31%	95.1°
2032-09-11 Sat	100	—	unknown	21:15–05:15 (good, 8.0 h)	87.2° 22:55	8.19	41%	87.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-08-13&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.