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 Triangulum Pinwheel: 08-30 (100), 08-31 (100), 09-01 (100), 09-02 (100), 09-03 (100) — by astronomy; check the weather when the night is within four days.

2032-08-21astronomy score per night — click a bar for that night2032-09-19

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-08-21 Sat	36	—	unknown	23:20–04:55 (marginal, 5.58 h)	79.1° 04:55	7.02	99%	52.6°
2032-08-22 Sun	25	—	unknown	23:20–05:00 (marginal, 5.67 h)	79.1° 04:50	7.08	95%	39.2°
2032-08-23 Mon	24	—	unknown	23:10–05:00 (marginal, 5.83 h)	79.1° 04:45	7.13	88%	27.5°
2032-08-24 Tue	34	—	unknown	22:55–05:00 (marginal, 6.08 h)	79.1° 04:40	7.19	80%	20.1°
2032-08-25 Wed	47	—	unknown	22:40–05:05 (marginal, 6.42 h)	79.1° 04:35	7.25	70%	21.1°
2032-08-26 Thu	72	—	unknown	23:35–03:30 (good, 3.92 h)	79.1° 04:35	7.3	59%	29.1°
2032-08-27 Fri	85	—	unknown	23:00–05:05 (good, 6.08 h)	79.1° 04:30	7.36	49%	39.6°
2032-08-28 Sat	91	—	unknown	23:00–05:05 (good, 6.08 h)	79.1° 04:25	7.42	39%	50.8°
2032-08-29 Sun	98	—	unknown	22:55–05:10 (good, 6.25 h)	79.1° 04:20	7.47	29%	62.2°
2032-08-30 Mon	100	—	unknown	22:50–05:10 (good, 6.33 h)	79.1° 04:20	7.53	21%	73.6°
2032-08-31 Tue	100	—	unknown	22:45–05:10 (good, 6.42 h)	79.1° 04:15	7.59	14%	84.9°
2032-09-01 Wed	100	—	unknown	22:40–05:15 (good, 6.58 h)	79.1° 04:10	7.64	8%	96.1°
2032-09-02 Thu	100	—	unknown	22:40–05:15 (good, 6.58 h)	79.1° 04:05	7.7	4%	107.3°
2032-09-03 Fri	100	—	unknown	22:35–05:15 (good, 6.67 h)	79.1° 04:00	7.75	1%	118.3°
2032-09-04 Sat	100	—	unknown	22:30–05:15 (good, 6.75 h)	79.1° 04:00	7.81	0%	129.1°
2032-09-05 Sun	100	—	unknown	22:25–05:20 (good, 6.92 h)	79.1° 03:55	7.86	1%	139.6°
2032-09-06 Mon	100	—	unknown	22:25–05:20 (good, 6.92 h)	79.1° 03:50	7.92	4%	149.3°
2032-09-07 Tue	100	—	unknown	22:20–05:20 (good, 7.0 h)	79.1° 03:45	7.97	8%	157.2°
2032-09-08 Wed	100	—	unknown	22:15–05:20 (good, 7.08 h)	79.1° 03:40	8.03	14%	160.5°
2032-09-09 Thu	100	—	unknown	22:10–05:25 (good, 7.25 h)	79.1° 03:40	8.08	22%	157.0°
2032-09-10 Fri	100	—	unknown	22:10–05:25 (good, 7.25 h)	79.1° 03:35	8.14	31%	148.6°
2032-09-11 Sat	100	—	unknown	22:05–05:25 (good, 7.33 h)	79.1° 03:30	8.19	41%	138.0°
2032-09-12 Sun	100	—	unknown	22:05–05:25 (good, 7.33 h)	79.1° 03:25	8.24	52%	126.2°
2032-09-13 Mon	100	—	unknown	22:05–05:30 (good, 7.42 h)	79.1° 03:25	8.3	62%	113.6°
2032-09-14 Tue	100	—	unknown	22:10–05:30 (good, 7.33 h)	79.1° 03:20	8.35	73%	100.5°
2032-09-15 Wed	100	—	unknown	22:20–05:30 (good, 7.17 h)	79.1° 03:15	8.4	83%	86.9°
2032-09-16 Thu	100	—	unknown	23:55–05:30 (good, 5.58 h)	79.1° 03:10	8.45	91%	73.0°
2032-09-17 Fri	70	—	unknown	03:20–05:35 (good, 2.25 h)	79.1° 03:05	8.51	97%	59.0°
2032-09-18 Sat	53	—	unknown	21:40–05:35 (marginal, 7.92 h)	79.1° 03:05	8.56	100%	45.2°
2032-09-19 Sun	31	—	unknown	21:40–05:35 (marginal, 7.92 h)	79.1° 03:00	8.61	100%	32.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-08-21&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.