{"version":1,"generatedAt":"2026-10-28T10:38:56.207Z","kind":"greatest-elongation","name":"Mercury at greatest eastern elongation, 28 May 2027","at":"2027-05-28T10:00:00.000Z","planets":[{"name":"Mercury","magnitude":0.47}],"place":{"ra":5.951,"dec":25.36,"frame":"J2000","raUnit":"hours","decUnit":"degrees"},"degreesFromSun":22.9,"sky":"evening","elongationDeg":22.9,"litFraction":0.37,"visibility":{"longitude":0,"timeZone":"UTC","twilightSunAltitude":-6,"bands":[{"latitude":60,"verdict":"low","summary":"Low: 4° up in the NW at 22:20; a clear, flat horizon needed","best":{"at":"2027-05-27T22:20:00.000Z","altitude":4.3,"azimuth":317,"sunAltitude":-6.2}},{"latitude":45,"verdict":"clear","summary":"10° up in the WNW at 20:20","best":{"at":"2027-05-28T20:20:00.000Z","altitude":10.4,"azimuth":296,"sunAltitude":-7.1}},{"latitude":30,"verdict":"clear","summary":"14° up in the WNW at 19:30","best":{"at":"2027-05-28T19:30:00.000Z","altitude":13.5,"azimuth":292,"sunAltitude":-7.7}},{"latitude":15,"verdict":"clear","summary":"17° up in the WNW at 18:50","best":{"at":"2027-05-28T18:50:00.000Z","altitude":16.5,"azimuth":292,"sunAltitude":-6.3}},{"latitude":0,"verdict":"clear","summary":"15° up in the WNW at 18:30","best":{"at":"2027-05-28T18:30:00.000Z","altitude":14.9,"azimuth":296,"sunAltitude":-7.6}},{"latitude":-15,"verdict":"clear","summary":"14° up in the WNW at 18:00","best":{"at":"2027-05-28T18:00:00.000Z","altitude":14.1,"azimuth":302,"sunAltitude":-6.1}},{"latitude":-30,"verdict":"low","summary":"Low: 10° up in the NW at 17:40; a clear, flat horizon needed","best":{"at":"2027-05-28T17:40:00.000Z","altitude":9.5,"azimuth":307,"sunAltitude":-7}},{"latitude":-45,"verdict":"low","summary":"Low: 4° up in the NW at 17:10; a clear, flat horizon needed","best":{"at":"2027-05-28T17:10:00.000Z","altitude":4.4,"azimuth":313,"sunAltitude":-7.1}}]},"links":{"page":"https://www.whatthestar.com/planets/mercury-greatest-elongation-2027-05-28","map":"https://www.whatthestar.com/explore?ra=5.951&dec=25.36&fov=40&t=2027-05-28T10%3A00%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"}]}