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 HD 189733: 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.

2032-05-13astronomy score per night — click a bar for that night2032-06-11

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-05-13 Thu	90	—	unknown	00:50–04:10 (good, 3.33 h)	71.1° 05:55	5.66	19%	137.2°
2032-05-14 Fri	91	—	unknown	00:50–04:10 (good, 3.33 h)	71.1° 05:50	5.6	27%	141.6°
2032-05-15 Sat	91	—	unknown	00:45–04:05 (good, 3.33 h)	71.1° 05:45	5.55	36%	143.1°
2032-05-16 Sun	91	—	unknown	00:45–04:05 (good, 3.33 h)	71.1° 05:40	5.5	46%	141.3°
2032-05-17 Mon	92	—	unknown	00:40–04:05 (good, 3.42 h)	71.1° 05:40	5.44	55%	136.7°
2032-05-18 Tue	91	—	unknown	00:40–04:00 (good, 3.33 h)	71.1° 05:35	5.39	64%	130.1°
2032-05-19 Wed	91	—	unknown	00:35–04:00 (good, 3.42 h)	71.1° 05:30	5.34	73%	122.1°
2032-05-20 Thu	89	—	unknown	00:35–04:00 (good, 3.42 h)	71.1° 05:25	5.29	82%	113.0°
2032-05-21 Fri	73	—	unknown	00:40–03:55 (good, 3.25 h)	71.1° 05:20	5.24	89%	103.2°
2032-05-22 Sat	63	—	unknown	00:45–03:55 (good, 3.17 h)	71.1° 05:20	5.2	94%	93.0°
2032-05-23 Sun	53	—	unknown	01:35–03:55 (good, 2.33 h)	71.1° 05:15	5.15	98%	82.3°
2032-05-24 Mon	44	—	unknown	02:30–03:55 (good, 1.42 h)	71.1° 05:10	5.1	100%	71.6°
2032-05-25 Tue	36	—	unknown	23:50–03:50 (marginal, 4.0 h)	71.1° 05:05	5.06	99%	61.1°
2032-05-26 Wed	32	—	unknown	23:45–03:50 (marginal, 4.08 h)	71.1° 05:00	5.01	96%	51.4°
2032-05-27 Thu	32	—	unknown	23:40–03:50 (marginal, 4.17 h)	71.1° 05:00	4.97	90%	43.3°
2032-05-28 Fri	39	—	unknown	23:25–03:50 (marginal, 4.42 h)	71.1° 04:55	4.93	82%	38.1°
2032-05-29 Sat	63	—	unknown	23:50–03:50 (good, 4.0 h)	71.1° 04:50	4.89	72%	37.2°
2032-05-30 Sun	76	—	unknown	23:45–03:45 (good, 4.0 h)	71.1° 04:45	4.85	61%	40.8°
2032-05-31 Mon	89	—	unknown	23:40–03:45 (good, 4.08 h)	71.1° 04:45	4.81	49%	47.9°
2032-06-01 Tue	96	—	unknown	23:40–03:45 (good, 4.08 h)	71.1° 04:40	4.78	38%	56.9°
2032-06-02 Wed	100	—	unknown	23:35–03:45 (good, 4.17 h)	71.1° 04:35	4.74	28%	67.1°
2032-06-03 Thu	100	—	unknown	23:30–03:45 (good, 4.25 h)	71.1° 04:30	4.71	18%	77.7°
2032-06-04 Fri	100	—	unknown	23:25–03:40 (good, 4.25 h)	71.1° 04:25	4.68	11%	88.5°
2032-06-05 Sat	100	—	unknown	23:20–03:40 (good, 4.33 h)	71.1° 04:25	4.65	5%	99.1°
2032-06-06 Sun	100	—	unknown	23:20–03:40 (good, 4.33 h)	71.1° 04:20	4.62	1%	109.4°
2032-06-07 Mon	100	—	unknown	23:15–03:40 (good, 4.42 h)	71.1° 04:15	4.59	0%	119.1°
2032-06-08 Tue	100	—	unknown	23:10–03:40 (good, 4.5 h)	71.1° 04:10	4.57	1%	127.8°
2032-06-09 Wed	100	—	unknown	23:05–03:40 (good, 4.58 h)	71.1° 04:05	4.54	4%	135.1°
2032-06-10 Thu	100	—	unknown	23:05–03:40 (good, 4.58 h)	71.1° 04:05	4.52	8%	140.4°
2032-06-11 Fri	100	—	unknown	23:10–03:40 (good, 4.5 h)	71.1° 04:00	4.5	14%	142.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-05-13&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.