Presented at StarFest 2005 Bays Mountain Preserve, Oct 22, 2005
and PowerPoint slide utilities are engaged to graphically determine the parallax of a near object observed by amateur astronomers.
This graphical method seems to favorably compare with spherical trigonometry methods (not discussed). Though applicable to
some planets and our Moon, the technique will be demonstrated with comets on close approach (~1 au). This is useful for planned
coordinated viewing/photography and for a classroom experiment to determine distance of approach. The technique can be extended
to very close objects such as satellites and meteors, but video imaging and processing will be required.
Cometary Parallax (1.5 MB PPT)