Tag Archives: telescope

Telescope Time Machine

extrude, slice and dice – best served defocused by Ted Frimet Almost every amateur observer wants to get the biggest bang for their buck. This is especially true when they sit down for a spell, to look at the wonders … Continue reading

Posted in Mid-summer 2017, Sidereal Times | Tagged , | Leave a comment

From Backyard to Mountaintop: The Adventures of History’s Best Worst Telescope

by Michael Wright Our first meeting of the new year will be on Tuesday, January 13, 2015 at 7:30 p.m. in a new location:  Bowen Hall (see Princeton campus maps for building and parking locations).  Alan Hirshfeld, Professor of Physics at the University … Continue reading

Posted in January 2015, Sidereal Times | Tagged , , , , , | Leave a comment

How to Buy Your First Telescope

by Michael Wright Around the holidays, astronomers get asked by friends and family members about how to buy a first telescope.  In fact, the club received just such a questions last week from someone whose interest was sparked by a … Continue reading

Posted in December 2013 | Tagged , , | Leave a comment

No More Peeping into a Telescope

by Prasad Ganti The word “telescope” conjures an image of a long scope with lenses or mirrors and an eyepiece to peep in to see the light collected by the lenses and mirrors. Well, this is the traditional optical telescope, … Continue reading

Posted in October 2013, Sidereal Times | Tagged , | Leave a comment

Geometrical Optics and the Hastings-Byrne Refractor: Part II

John Church Last month I reviewed the “lens-maker’s formula” that allows one to calculate the focal length (the inverse of the “power”) of a thin lens, provided that one knows the refractive index of the glass and the radii of … Continue reading

Posted in April 2012 | Tagged , , , , | 1 Comment