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Re: Lunars at Cusco, Peru
From: Paul Hirose
Date: 2024 Jun 14, 10:49 -0700

> *From: *Martin Caminos > *Date: *2024 Jun 13, 10:55 -0700 > > In my case, the day of the sight, the pressure at Cusco (that I checked > online) was 688 and the temperature was 12 C. But pressure is 668 in your screen shot. That's very close to the 3400 m pressure in a standard atmosphere (666 mb). What was the correct pressure? > With that, I calculated the following refraction corrections: > > Regulus: -0.45 ' > > Moon: -1.29 ' Azimuths are almost identical, so the refraction correction to lunar distance is almost the difference of the altitude refractions. 2024-06-10 00:03:50.00 UTC 2024-06-10 00:03:50.00 UT1 2024-06-10 00:04:59.20 TT -71°55.00' -13°31.40' east lon, north lat 3400.0 meters (11155 feet) above ellipsoid 12.0 C (53.6 F) at observer 1013.3 mb (29.92″ Hg) altimeter setting 666.3 mb (19.68″ Hg) air pressure Moon 17°46.67' computed unrefracted center altitude -15.31' unrefracted semidiameter 1.98' refraction 17°33.34' apparent lower limb altitude 301°49.68' predicted azimuth Regulus 46°37.90' computed unrefracted center altitude 0.60' refraction 46°38.50' apparent center altitude 304°12.32' predicted azimuth topocentric apparent Moon to Regulus angle 28°55.24' center to center, unrefracted 1.35' refraction 28°53.89' center to center, refracted 15.28' Moon far limb refracted SD 29°10.00' observed angle 29°09.17' computed Moon to Regulus +0.83' observed - computed -- Paul Hirose sofajpl.com

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