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: 08-01 (95), 07-31 (94), 08-02 (94), 07-30 (93), 07-29 (91) — by astronomy; check the weather when the night is within four days.

2047-07-12astronomy score per night — click a bar for that night2047-08-10

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2047-07-12 Fri	16	—	unknown	01:50–03:55 (marginal, 2.08 h)	79.2° 07:35	4.87	70%	37.7°
2047-07-13 Sat	19	—	unknown	01:40–03:55 (marginal, 2.25 h)	79.2° 07:30	4.91	60%	27.0°
2047-07-14 Sun	25	—	unknown	03:35–04:00 (good, 0.42 h)	79.2° 07:25	4.95	51%	18.1°
2047-07-15 Mon	32	—	unknown	02:15–04:00 (good, 1.75 h)	79.2° 07:20	5.0	41%	14.3°
2047-07-16 Tue	39	—	unknown	02:05–04:00 (good, 1.92 h)	79.2° 07:20	5.04	32%	19.0°
2047-07-17 Wed	47	—	unknown	01:45–04:00 (good, 2.25 h)	79.2° 07:15	5.08	24%	28.1°
2047-07-18 Thu	56	—	unknown	01:40–04:05 (good, 2.42 h)	79.2° 07:10	5.13	16%	38.9°
2047-07-19 Fri	63	—	unknown	01:40–04:05 (good, 2.42 h)	79.2° 07:05	5.17	9%	50.3°
2047-07-20 Sat	68	—	unknown	01:35–04:05 (good, 2.5 h)	79.2° 07:00	5.22	4%	62.3°
2047-07-21 Sun	71	—	unknown	01:30–04:10 (good, 2.67 h)	79.2° 07:00	5.27	1%	74.6°
2047-07-22 Mon	73	—	unknown	01:25–04:10 (good, 2.75 h)	79.2° 06:55	5.32	0%	87.2°
2047-07-23 Tue	75	—	unknown	01:25–04:10 (good, 2.75 h)	79.2° 06:50	5.37	1%	100.2°
2047-07-24 Wed	79	—	unknown	01:20–04:15 (good, 2.92 h)	79.2° 06:45	5.42	5%	113.3°
2047-07-25 Thu	82	—	unknown	01:15–04:15 (good, 3.0 h)	79.2° 06:40	5.47	10%	126.5°
2047-07-26 Fri	84	—	unknown	01:10–04:15 (good, 3.08 h)	79.2° 06:40	5.52	18%	139.6°
2047-07-27 Sat	87	—	unknown	01:05–04:20 (good, 3.25 h)	79.2° 06:35	5.57	28%	152.1°
2047-07-28 Sun	89	—	unknown	01:05–04:20 (good, 3.25 h)	79.2° 06:30	5.63	39%	162.5°
2047-07-29 Mon	91	—	unknown	01:00–04:20 (good, 3.33 h)	79.2° 06:25	5.68	50%	165.1°
2047-07-30 Tue	93	—	unknown	00:55–04:20 (good, 3.42 h)	79.2° 06:25	5.73	62%	156.9°
2047-07-31 Wed	94	—	unknown	00:55–04:25 (good, 3.5 h)	79.2° 06:20	5.79	72%	144.8°
2047-08-01 Thu	95	—	unknown	00:55–04:25 (good, 3.5 h)	79.2° 06:15	5.84	82%	131.7°
2047-08-02 Fri	94	—	unknown	00:55–04:25 (good, 3.5 h)	79.2° 06:10	5.9	90%	118.3°
2047-08-03 Sat	88	—	unknown	01:00–04:30 (good, 3.5 h)	79.2° 06:05	5.95	96%	105.0°
2047-08-04 Sun	63	—	unknown	01:15–04:30 (good, 3.25 h)	79.2° 06:05	6.01	99%	91.7°
2047-08-05 Mon	49	—	unknown	02:35–04:30 (good, 1.92 h)	79.2° 06:00	6.07	100%	78.7°
2047-08-06 Tue	38	—	unknown	00:15–04:35 (marginal, 4.33 h)	79.2° 05:55	6.12	99%	65.9°
2047-08-07 Wed	28	—	unknown	00:15–04:35 (marginal, 4.33 h)	79.2° 05:50	6.18	95%	53.6°
2047-08-08 Thu	23	—	unknown	00:15–04:35 (marginal, 4.33 h)	79.2° 05:45	6.24	90%	41.8°
2047-08-09 Fri	21	—	unknown	00:10–04:40 (marginal, 4.5 h)	79.2° 05:45	6.29	83%	30.6°
2047-08-10 Sat	27	—	unknown	23:55–04:40 (marginal, 4.75 h)	79.2° 05:40	6.35	75%	20.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2047-07-12&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.