Archive for the ‘Eric Grieve’ Category

National Astronomy Day at the Alexander Telescope

Members of Farnham Astronomical Society marked National Astronomy Day (on 24 April 2010) at Aldershot Observatory with the Patrick Alexander telescope. Society member Eric Grieve opened up the dome to the afternoon sunshine and talked through the operation of the telescope with members and their...
April 25th, 2010 | Danny Thomas, Eric Grieve, Featured Articles, Kevin Pretorius, Observing, Past events | Read More

Solar Disk Imaged by Eric Grieve

A sunspot is an area on the Sun’s surface (its photosphere) that appears dark because they are cooler than the surrounding area  – approximately 4,000–4,500 K compared with the 5,800 K of the surrounding material at about 5,800 K .  They are visible as a dark spot because the intensity...
August 3rd, 2009 | Eric Grieve | Read More

Sun Dog and Circumzenithal Arc Photographed by Eric Grieve

A sun dog or sundog is a type of ice halo. It is a colored patch of light to the left or right of the sun.  The circumzenithal arc is similar in appearance to a rainbow.  It is caused by refraction of sunlight through horizontally-oriented ice crystals.
August 3rd, 2009 | Eric Grieve | Read More