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 North America Nebula: 05-10 (92), 05-09 (91), 05-08 (90), 05-07 (88), 05-06 (87) — by astronomy; check the weather when the night is within four days.

2032-04-11astronomy score per night — click a bar for that night2032-05-10

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-04-11 Sun	62	—	unknown	02:40–05:10 (good, 2.5 h)	87.2° 08:55	7.49	4%	78.2°
2032-04-12 Mon	62	—	unknown	02:40–05:05 (good, 2.42 h)	87.2° 08:55	7.43	10%	86.2°
2032-04-13 Tue	63	—	unknown	02:35–05:05 (good, 2.5 h)	87.2° 08:50	7.38	16%	94.1°
2032-04-14 Wed	65	—	unknown	02:30–05:05 (good, 2.58 h)	87.2° 08:45	7.32	25%	101.6°
2032-04-15 Thu	66	—	unknown	02:25–05:00 (good, 2.58 h)	87.2° 08:40	7.26	34%	108.5°
2032-04-16 Fri	67	—	unknown	02:20–05:00 (good, 2.67 h)	87.2° 08:35	7.2	43%	114.7°
2032-04-17 Sat	66	—	unknown	02:25–04:55 (good, 2.5 h)	87.2° 08:35	7.15	53%	119.9°
2032-04-18 Sun	67	—	unknown	02:20–04:55 (good, 2.58 h)	87.2° 08:30	7.09	62%	123.9°
2032-04-19 Mon	67	—	unknown	02:20–04:55 (good, 2.58 h)	87.2° 08:25	7.03	71%	126.4°
2032-04-20 Tue	67	—	unknown	02:15–04:50 (good, 2.58 h)	87.2° 08:20	6.97	79%	127.1°
2032-04-21 Wed	66	—	unknown	02:15–04:50 (good, 2.58 h)	87.2° 08:20	6.91	86%	126.0°
2032-04-22 Thu	60	—	unknown	02:10–04:45 (good, 2.58 h)	87.2° 08:15	6.86	92%	123.0°
2032-04-23 Fri	59	—	unknown	02:10–04:45 (good, 2.58 h)	87.2° 08:10	6.8	97%	118.3°
2032-04-24 Sat	55	—	unknown	02:10–04:45 (good, 2.58 h)	87.2° 08:05	6.74	100%	112.4°
2032-04-25 Sun	50	—	unknown	02:10–04:40 (good, 2.5 h)	87.2° 08:00	6.68	100%	105.4°
2032-04-26 Mon	46	—	unknown	02:15–04:40 (good, 2.42 h)	87.2° 08:00	6.62	98%	97.6°
2032-04-27 Tue	43	—	unknown	02:20–04:40 (good, 2.33 h)	87.2° 07:55	6.56	94%	89.5°
2032-04-28 Wed	41	—	unknown	02:25–04:35 (good, 2.17 h)	87.2° 07:50	6.51	88%	81.3°
2032-04-29 Thu	42	—	unknown	02:05–04:35 (good, 2.5 h)	87.2° 07:45	6.45	79%	73.3°
2032-04-30 Fri	45	—	unknown	01:55–04:30 (good, 2.58 h)	87.2° 07:40	6.39	69%	66.0°
2032-05-01 Sat	54	—	unknown	01:25–04:30 (good, 3.08 h)	87.2° 07:40	6.33	58%	59.8°
2032-05-02 Sun	64	—	unknown	01:20–04:30 (good, 3.17 h)	87.2° 07:35	6.27	47%	55.3°
2032-05-03 Mon	71	—	unknown	01:15–04:25 (good, 3.17 h)	87.2° 07:30	6.22	36%	53.0°
2032-05-04 Tue	79	—	unknown	01:10–04:25 (good, 3.25 h)	87.2° 07:25	6.16	25%	53.4°
2032-05-05 Wed	85	—	unknown	01:10–04:25 (good, 3.25 h)	87.2° 07:25	6.1	16%	56.3°
2032-05-06 Thu	87	—	unknown	01:05–04:20 (good, 3.25 h)	87.2° 07:20	6.04	8%	61.3°
2032-05-07 Fri	88	—	unknown	01:00–04:20 (good, 3.33 h)	87.2° 07:15	5.99	3%	67.8°
2032-05-08 Sat	90	—	unknown	00:55–04:20 (good, 3.42 h)	87.2° 07:10	5.93	0%	75.2°
2032-05-09 Sun	91	—	unknown	00:50–04:15 (good, 3.42 h)	87.2° 07:05	5.88	0%	83.1°
2032-05-10 Mon	92	—	unknown	00:50–04:15 (good, 3.42 h)	87.2° 07:05	5.82	2%	91.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-04-11&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.