ExpertAverage RatingsExpertise

Paul Wagner

Astronomy and telescope making. Have made at least seven telescopes, both refractors and reflectors, and have spent 30 years looking at the nighttime sky.

Harry Hayfield

Particular expert in eclipses (both solar and lunar), but able to answer most questions about astronomy or refer to a website that can help

Courtney Seligman

I can answer almost any question about astronomy and related sciences, such as physics and geology. I will not answer questions about astrology and similar pseudo-scientific rubbish.

Philip Stahl

On Vacation
returns 09/18/2016
I have more than forty years of experience in Astronomy, specifically solar and space physics. My specialties include the physics of solar flares, sunspots, including their effects on Earth and statistics pertaining to sunspot morphology and flare geo-effectiveness.

Recent Answers

2016-08-23 Celestial Coordinate Conversions:

Here is a link to a detailed discussion of how to use spherical trigonometry to convert from ecliptic to galactic coordinates, or the reverse:

2016-08-13 space telescopes:

Hello,    The Hubble's optics are enclosed because its aperture at 2.4 m (7.9 ft.) made it more practical to do so - apart from the fact it followed an original design to that end. The JWST with six hexagonal

2016-07-27 Gauging the distant to stars:

As you obviously know, the stellar parallax method becomes unreliable for stars at great distances, because the uncertainty of the measurements is at least 0.002 arcsec, and even for stars at a distance

2016-07-12 What did we see tonight.:

Hi Valerie    You don't mention what part of the sky this was in---and that makes a very big difference.  If what you saw was within about 20 degrees of the horizon, then I am pretty sure that you saw

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