Welcome to the homepage of the Solar Observation in Bulgaria - SOB

SOB is the solar physics project of the National Astronomical Observatory (NAO) Rozhen. The project is part of the research activities of the Department 'Sun and Solar System' at the Institute of Astronomy (IA) and NAO Rozhen, Bulgarian Academy of Sciences.

Astronomy Calendar of Celestial Events 2011
Astronomy Calendar of Celestial Events 2011
 
The Astronomy calendar includes data for some general celestial events during 2011. In all reports, times and dates are in standard time for Sofia, Bulgaria. More reports generated by Astronomy Lab 2 for Windows, marked on the page as astron. lab. In all reports, times and dates are in standard time for Sofia, Bulgaria
or explicit is written Universal Time (UT). Times are in 24 hour format.
 

Merry Christmas and Happy New 2012 Year

Submitted by nikipetrov on 24 December, 2011 - 13:16
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Wish you all a Merry Christmas and a Happy New Year!

 

Total Lunar Eclipse on 10 Dec 2011

The total Lunar eclipse on 10 Dec 2011 was an unusually phenomenon for observers in Bulgaria. In the moment of sunset the Moon rises on the horizon obscured by Earth’s shadow.

 
Fig. 1. Eclipse of the Moon on 10Dec 2011. CANON 1Ds MarkII, with 400 mm F/5.6 lenses, 1/8 sec. at 3200 ISO.
 

Frost Flower and Ice Ribbons

At middle latitudes or high altitudes in autumn conditions arise in which we can observe ribbons ice formations. In late October and early November 2011 immediately above the ground around the stems of some plants appeared icy ribbons.

Fig. 1. Ice ribbons

Iridescent Moon ring

Often we can see an iridescent crown (ring or halo) around the Moon. From time immemorial, this phenomenon is related to the culture of many nations, a harbinger of cold, rain or snow. But often the beauty of nature is short and portends bad weather.

Fig.1. Iridescent crown around the Moon (06 Nov 2011).

Iridescent cloud over the Rila Mountain

Submitted by nikipetrov on 31 October, 2011 - 11:44
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Iridescent cloud

Canon PowerShot SX10 IS, focal length: 40mm, f/5.0, exp. time: 1/640 sec, ISO: 80

28 Oct 2011 06:49 UT, photo: Anton Stoychev

 

The Green Flash Phenomenon

"Ever gazed upon the green flash, Master Gibbs?"
"I reckon I've seen my fair share. Happens on rare occasion; the last glimpse of sunset, a green flash shoots up into the sky. Some go their whole lives without ever seeing it. Some claim to have seen it who ain't. And some say... "
"It signals when a soul comes back to this world, from the dead!"

― Hector Barbossa, Joshamee Gibbs and Pintеl to Will Turner. Pirates of the Caribbean – At World’s End

Sunspots observations 03-09 August 2011
Sunspot observations during the summer astronomical school, 3rd - 9th August 2011, NAO Rozhen. The animated picture presents the movement of the sunspots (active regions 1260, 1261 and 1263) across the solar disc for 6 days.

 

Partial Solar eclipse on 01 June 2011
Partial Solar eclipse on 01 June 2011
Sun rise: 02:52 UT
Sun set: 17:58 UT
First contact:                                 19:25 UT
Time of maximum eclipse:        21:16 UT
Last contact:                                 23:07 UT

Mercury: The Key to Terrestrial Planet Evolution
The spacecraft MESSENGER obtained first images of Mercury, the planet closest to the Sun.
More information.
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