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: 05-08 (84), 05-07 (82), 05-06 (80), 05-05 (79), 05-04 (73) — by astronomy; check the weather when the night is within four days.

2032-04-09astronomy score per night — click a bar for that night2032-05-08

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-04-09 Fri	54	—	unknown	03:05–05:15 (good, 2.17 h)	71.1° 08:05	7.61	0%	73.6°
2032-04-10 Sat	54	—	unknown	03:00–05:10 (good, 2.17 h)	71.1° 08:05	7.55	1%	84.8°
2032-04-11 Sun	56	—	unknown	03:00–05:10 (good, 2.17 h)	71.1° 08:00	7.49	4%	95.8°
2032-04-12 Mon	57	—	unknown	02:55–05:05 (good, 2.17 h)	71.1° 07:55	7.43	10%	106.5°
2032-04-13 Tue	57	—	unknown	02:50–05:05 (good, 2.25 h)	71.1° 07:50	7.38	16%	116.4°
2032-04-14 Wed	59	—	unknown	02:45–05:05 (good, 2.33 h)	71.1° 07:50	7.32	25%	125.4°
2032-04-15 Thu	60	—	unknown	02:40–05:00 (good, 2.33 h)	71.1° 07:45	7.26	34%	133.2°
2032-04-16 Fri	61	—	unknown	02:40–05:00 (good, 2.33 h)	71.1° 07:40	7.2	43%	139.1°
2032-04-17 Sat	61	—	unknown	02:40–04:55 (good, 2.25 h)	71.1° 07:35	7.15	53%	142.5°
2032-04-18 Sun	61	—	unknown	02:35–04:55 (good, 2.33 h)	71.1° 07:30	7.09	62%	142.8°
2032-04-19 Mon	62	—	unknown	02:35–04:55 (good, 2.33 h)	71.1° 07:30	7.03	71%	140.1°
2032-04-20 Tue	61	—	unknown	02:30–04:50 (good, 2.33 h)	71.1° 07:25	6.97	79%	134.7°
2032-04-21 Wed	61	—	unknown	02:25–04:50 (good, 2.42 h)	71.1° 07:20	6.91	86%	127.5°
2032-04-22 Thu	54	—	unknown	02:25–04:45 (good, 2.33 h)	71.1° 07:15	6.86	92%	119.0°
2032-04-23 Fri	50	—	unknown	02:25–04:45 (good, 2.33 h)	71.1° 07:10	6.8	97%	109.6°
2032-04-24 Sat	44	—	unknown	02:30–04:45 (good, 2.25 h)	71.1° 07:10	6.74	100%	99.6°
2032-04-25 Sun	37	—	unknown	03:00–04:40 (good, 1.67 h)	71.1° 07:05	6.68	100%	89.2°
2032-04-26 Mon	33	—	unknown	03:40–04:40 (good, 1.0 h)	71.1° 07:00	6.62	98%	78.6°
2032-04-27 Tue	29	—	unknown	04:15–04:40 (good, 0.42 h)	71.1° 06:55	6.56	94%	68.1°
2032-04-28 Wed	27	—	unknown	01:30–04:35 (marginal, 3.08 h)	71.1° 06:55	6.51	88%	58.0°
2032-04-29 Thu	29	—	unknown	01:25–04:35 (marginal, 3.17 h)	71.1° 06:50	6.45	79%	48.8°
2032-04-30 Fri	32	—	unknown	03:35–04:30 (good, 0.92 h)	71.1° 06:45	6.39	69%	41.5°
2032-05-01 Sat	41	—	unknown	02:05–04:30 (good, 2.42 h)	71.1° 06:40	6.33	58%	37.4°
2032-05-02 Sun	56	—	unknown	01:35–04:30 (good, 2.92 h)	71.1° 06:35	6.27	47%	37.6°
2032-05-03 Mon	65	—	unknown	01:30–04:25 (good, 2.92 h)	71.1° 06:35	6.22	36%	42.1°
2032-05-04 Tue	73	—	unknown	01:30–04:25 (good, 2.92 h)	71.1° 06:30	6.16	25%	49.7°
2032-05-05 Wed	79	—	unknown	01:25–04:25 (good, 3.0 h)	71.1° 06:25	6.1	16%	59.2°
2032-05-06 Thu	80	—	unknown	01:20–04:20 (good, 3.0 h)	71.1° 06:20	6.04	8%	69.7°
2032-05-07 Fri	82	—	unknown	01:15–04:20 (good, 3.08 h)	71.1° 06:15	5.99	3%	80.7°
2032-05-08 Sat	84	—	unknown	01:10–04:20 (good, 3.17 h)	71.1° 06:15	5.93	0%	91.6°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-04-09&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.