NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Daytime Venus Rising Dip Short
From: Alexandre Eremenko
Date: 2012 May 3, 18:14 -0400
From: Alexandre Eremenko
Date: 2012 May 3, 18:14 -0400
Greg, I like your detailed report but you do not mention one crucial thing: what was the local time of your observation? :-) I could find Venus several times from my balcony shortly before the sunset with a naked eye, and about 1 hour before the sunset with a sextant. Bill B wrote yesterday that he is also employing his new 7x prismatic scope for the search of Venus. Soviet Cel Nav manuals recommend shooting Venus in daytime to obtain an immediate fix, the second line coming from the Sun. (I mean when Sun and Moon are not available). They emphasize that this way you obtain the most precise fixes. Alex. On Thu, 3 May 2012, Greg Rudzinski wrote: > > Today Venus was observed during the day from my boat dock using a dip short horizon to the opposite side of the harbor (.157 NM) from an exact height of eye of 6.5 ft.. To prepare it was necessary to pre-calculate for an azimuth of 76* which gave me a 4* wide short horizon. Index error was checked by measuring the Sun's diameter on and off the arc. The measurement came in at 31.6' on and 31.6' off for zero error. My lucky day :) The online dip short calculator gave me a - 23.7' correction to apply to the (Hs). At the pre-calculated time the Tamaya Jupiter was raised and Venus showed herself as a faint elongated oval in the 7x35 scope. Five observations were done with an average intercept of 0.7' A and a spread of 0.9'. A CN first in the log books. > > A rather large sunspot is now visible. About the size Venus will be when she transits the Sun on the 5th of June during the late afternoon here in California. (see image 3277) > > Greg Rudzinski > ---------------------------------------------------------------- > NavList message boards and member settings: www.fer3.com/NavList > Members may optionally receive posts by email. > To cancel email delivery, send a message to NoMail[at]fer3.com > ---------------------------------------------------------------- > > > > Attached File: http://fer3.com/arc/img/119358.img_3277.jpg > > > : http://fer3.com/arc/m2.aspx?i=119358 > > >