On Feb 23, 4:36 pm, Sam Wormley <sworml...@gmail.com> wrote: > On 2/23/12 10:11 AM, oriel36 wrote: > > > In July,Sirius disappears from sight due to the orbital motion of the > > Earth and the glare of the central Sun - > > I've already pointed out to you, Gerald, that the "glare of the > central sun", or more simply, the sun, is not an impediment to > observers with modest instruments. >
It is not an issue,the disappearance of Sirius and its re-appearance results from the orbital motion of the Earth and the glare of the central Sun whereas putting Sirius in stellar circumpolar motion as Flamsteed did in drawing his ill-fated conclusion obscures,for want of a better word,the wonderful astronomical event which meant so much in antiquity as it coincided with the flooding of the Nile and today it is totally behind the Sun around Independence day and at the perihelion on July 4th.
A really nice and courteous astronomer I met lately told me how special a solar eclipse is and I have no doubt that it is however astronomical events go on all the time,everything from sunrise/ sunset,from the turning of the polar coordinate through the circle of illumination at the equinoxes,the appearance of Sirius due to the annual trek of the Earth and such simple things as the ebb and flow of the tides or complex things like evolutionary geology arising from the planet's motions,one event just as special as the next.
If you are intent in ignoring the orbital event surrounding Sirius then that is your choice in order to maintain the stellar circumpolar framework of Ra/Dec and the calendar based clockwork solar system it generates but so much of astronomy and its technical and historical details vanish with it.Unlike other times,I will not push the issue as people already know.