{"version":1,"generatedAt":"2026-10-28T10:38:56.207Z","kind":"greatest-elongation","name":"Mercury at greatest western elongation, 4 Nov 2027","at":"2027-11-04T08:50:00.000Z","planets":[{"name":"Mercury","magnitude":-0.51}],"place":{"ra":13.452,"dec":-6.79,"frame":"J2000","raUnit":"hours","decUnit":"degrees"},"degreesFromSun":18.8,"sky":"morning","elongationDeg":18.8,"litFraction":0.58,"visibility":{"longitude":0,"timeZone":"UTC","twilightSunAltitude":-6,"bands":[{"latitude":60,"verdict":"low","summary":"Low: 9° up in the ESE at 06:40; a clear, flat horizon needed","best":{"at":"2027-11-04T06:40:00.000Z","altitude":8.8,"azimuth":121,"sunAltitude":-6.4}},{"latitude":45,"verdict":"clear","summary":"11° up in the ESE at 06:10","best":{"at":"2027-11-04T06:10:00.000Z","altitude":11.4,"azimuth":112,"sunAltitude":-6.2}},{"latitude":30,"verdict":"clear","summary":"13° up in the ESE at 05:50","best":{"at":"2027-11-04T05:50:00.000Z","altitude":12.5,"azimuth":106,"sunAltitude":-6.2}},{"latitude":15,"verdict":"clear","summary":"11° up in the E at 05:30","best":{"at":"2027-11-04T05:30:00.000Z","altitude":11.3,"azimuth":100,"sunAltitude":-7.1}},{"latitude":0,"verdict":"low","summary":"Low: 9° up in the E at 05:10; a clear, flat horizon needed","best":{"at":"2027-11-04T05:10:00.000Z","altitude":8.7,"azimuth":97,"sunAltitude":-8.1}},{"latitude":-15,"verdict":"low","summary":"Low: 8° up in the E at 05:00; a clear, flat horizon needed","best":{"at":"2027-11-04T05:00:00.000Z","altitude":7.8,"azimuth":95,"sunAltitude":-6.2}},{"latitude":-30,"verdict":"lost","summary":"Lost in the horizon's haze: 2° up at best once it is dark","best":{"at":"2027-11-04T04:30:00.000Z","altitude":2.3,"azimuth":97,"sunAltitude":-7.6}},{"latitude":-45,"verdict":"lost","summary":"It is below the horizon whenever the sky is dark","best":{"at":"2027-11-04T04:00:00.000Z","altitude":-1.3,"azimuth":101,"sunAltitude":-6.4}}]},"links":{"page":"https://www.whatthestar.com/planets/mercury-greatest-elongation-2027-11-04","map":"https://www.whatthestar.com/explore?ra=13.452&dec=-6.79&fov=40&t=2027-11-04T08%3A50%3A00.000Z"},"sources":[{"name":"P. Bretagnon and G. Francou, VSOP87, the planetary theory the map draws, held to JPL’s DE441 within about an arcsecond over 1900–2100","url":"https://www.whatthestar.com/credits#method-planets"},{"name":"U.S. Naval Observatory and Sea and Sky’s Astronomy Calendar of Celestial Events: the dates and angles the tests hold these to","url":"https://aa.usno.navy.mil/data/"},{"name":"A. Mallama and J. Hilton (2018) and the Astronomical Almanac’s phase-angle series: the planets’ magnitudes","url":"https://www.whatthestar.com/credits#method-planets"},{"name":"J. Meeus, Astronomical Algorithms, ch. 25: the Sun, for the twilight each latitude is judged in","url":"https://www.whatthestar.com/credits#method-sun"}]}