NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Confidence in Moonsights
From: Paul Hirose
Date: 2022 Oct 16, 15:44 -0700
From: Paul Hirose
Date: 2022 Oct 16, 15:44 -0700
On 10/14/2022 10:30 AM, Andrés Ruiz wrote: > Once I obtained better results with a Link > A-12 aircraft bubble sextant than with two marine sextants, ASTRA and > C&P. Why? Because the Moon was nearly full and the glare in the horizon > made it very difficult to kiss it. The C&P Horizon Ultra sextant has a "Schüler double prism" which reduces Sun glare on the water. It also shows a discontinuity in the horizon when the sextant is not perpendicular. I suppose the device would also work for Moon observations. https://shop.cassens-plath.de/en/sextants/sextants/19/horizon-ultra#361857e02c1bb199398caa5ec1a3be5a Regarding Antoine's "Due to the significant Moon parallax, 3D corrections are required because the Earth is not a perfect sphere," my Lunar program does account for that. It also recommends the correct limbs (upper or lower, near or far), but accepts an observation of the wrong limb. -- Paul Hirose sofajpl.com
