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: 08-02 (100), 08-03 (100), 08-04 (100), 08-05 (100), 08-06 (100) — by astronomy; check the weather when the night is within four days.

2032-07-20astronomy score per night — click a bar for that night2032-08-18

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-07-20 Tue	58	—	unknown	01:45–04:10 (good, 2.42 h)	79.1° 07:00	5.25	95%	116.8°
2032-07-21 Wed	49	—	unknown	01:50–04:10 (good, 2.33 h)	79.1° 06:55	5.3	99%	103.0°
2032-07-22 Thu	39	—	unknown	02:30–04:10 (good, 1.67 h)	79.1° 06:50	5.35	100%	88.8°
2032-07-23 Fri	31	—	unknown	03:50–04:10 (good, 0.33 h)	79.1° 06:45	5.4	98%	74.5°
2032-07-24 Sat	25	—	unknown	01:05–04:15 (marginal, 3.17 h)	79.1° 06:45	5.45	93%	60.4°
2032-07-25 Sun	21	—	unknown	01:00–04:15 (marginal, 3.25 h)	79.1° 06:40	5.5	86%	46.8°
2032-07-26 Mon	21	—	unknown	00:55–04:15 (marginal, 3.33 h)	79.1° 06:35	5.55	76%	34.2°
2032-07-27 Tue	28	—	unknown	00:40–04:20 (marginal, 3.67 h)	79.1° 06:30	5.61	66%	24.0°
2032-07-28 Wed	39	—	unknown	02:35–04:20 (good, 1.75 h)	79.1° 06:25	5.66	55%	19.2°
2032-07-29 Thu	51	—	unknown	01:15–04:20 (good, 3.08 h)	79.1° 06:25	5.71	44%	22.8°
2032-07-30 Fri	66	—	unknown	00:50–04:25 (good, 3.58 h)	79.1° 06:20	5.77	34%	31.6°
2032-07-31 Sat	80	—	unknown	00:50–04:25 (good, 3.58 h)	79.1° 06:15	5.82	25%	42.3°
2032-08-01 Sun	91	—	unknown	00:45–04:25 (good, 3.67 h)	79.1° 06:10	5.88	16%	53.5°
2032-08-02 Mon	100	—	unknown	00:40–04:30 (good, 3.83 h)	79.1° 06:10	5.93	10%	64.9°
2032-08-03 Tue	100	—	unknown	00:35–04:30 (good, 3.92 h)	79.1° 06:05	5.99	5%	76.3°
2032-08-04 Wed	100	—	unknown	00:35–04:30 (good, 3.92 h)	79.1° 06:00	6.05	2%	87.7°
2032-08-05 Thu	100	—	unknown	00:30–04:35 (good, 4.08 h)	79.1° 05:55	6.1	0%	98.9°
2032-08-06 Fri	100	—	unknown	00:25–04:35 (good, 4.17 h)	79.1° 05:50	6.16	1%	110.1°
2032-08-07 Sat	100	—	unknown	00:20–04:35 (good, 4.25 h)	79.1° 05:50	6.22	3%	121.1°
2032-08-08 Sun	100	—	unknown	00:15–04:35 (good, 4.33 h)	79.1° 05:45	6.27	7%	131.8°
2032-08-09 Mon	100	—	unknown	00:15–04:40 (good, 4.42 h)	79.1° 05:40	6.33	12%	142.2°
2032-08-10 Tue	100	—	unknown	00:10–04:40 (good, 4.5 h)	79.1° 05:35	6.39	19%	151.6°
2032-08-11 Wed	100	—	unknown	00:05–04:40 (good, 4.58 h)	79.1° 05:30	6.44	27%	158.7°
2032-08-12 Thu	100	—	unknown	00:00–04:45 (good, 4.75 h)	79.1° 05:30	6.5	36%	160.5°
2032-08-13 Fri	100	—	unknown	23:55–04:45 (good, 4.83 h)	79.1° 05:25	6.56	46%	155.3°
2032-08-14 Sat	100	—	unknown	00:00–04:45 (good, 4.75 h)	79.1° 05:20	6.62	56%	146.0°
2032-08-15 Sun	100	—	unknown	23:55–04:50 (good, 4.92 h)	79.1° 05:15	6.67	67%	134.6°
2032-08-16 Mon	100	—	unknown	23:55–04:50 (good, 4.92 h)	79.1° 05:15	6.73	77%	122.1°
2032-08-17 Tue	100	—	unknown	23:55–04:50 (good, 4.92 h)	79.1° 05:10	6.79	86%	108.9°
2032-08-18 Wed	100	—	unknown	00:05–04:55 (good, 4.83 h)	79.1° 05:05	6.85	93%	95.1°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-07-20&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.