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The
major changes to the site
(excluding disk drawing and regular updates) are listed below.
- 28th September 2020 - New versions of the Helio
programs now available. Updates information about measuring sunspot
areas.
- 24th April 2020 - Created a Solar Papers page.
- 21st December 2014 -
The Solar Observing DVD is no longer
available.
- 1st June 2013 - Added
PDF document describing how to
construct a project box to the Observing the Sun webpage.
- 28th February 2013 -
Animations are back! This time for
whole years.
- 4th June 2010 - Solar
Observing CD-ROM replaced with a data DVD.
- 25th April 2006 -
Included new page on the
parallactic angle (for observing with altazimuth mounts).
- 8th March 2006 -
Included new pages for eclipses of
the Sun.
- 17th February 2006 -
Included new page for hydrogen
alpha disk drawings.
- 5th February 2006 -
Helio Viewer and Helio Creator
programs now freeware and price of Solar Observing CD-ROM reduced.
- 19th January 2006 -
included larger version of the
'Sun from Earth' animation and a zip version of the Helio v3.2 software.
- 23rd November 2005 -
Web site transfered to
http://www.petermeadows.com with all drawings and animations.
- 10th September 2005 -
The freeware Helio program
upgraded to v3.2 (the orientation of the solar disk can be selected for
altazimuth telescope mounting).
- 16th January 2005 -
Disk animations from 2001 are
only available on CD-ROM.
- 16th October 2004 -
The freeware Helio program
upgraded to v3.1 (the user can change the number of digits displayed
for various parameters, the number of digits output to the logfile has
been increased and a message can be displayed when using the logfile).
- 30th June 2004 - The
freeware Helio program upgraded
to v3.0.
- 20th June 2004 - Disk
drawings from 2000 (159
drawings) and disk animations from 2000 are only available on the
CD-ROM.
- 10th June 2004 - Added
transit of Venus observations.
- 22nd February 2004 -
Disk drawings from 1997 (1
drawing), 1998 (45 drawings) and 1999 (177 drawings) are only available
on the CD-ROM.
- 22nd February 2004 -
Disk animations for 1999 are
only available on the CD-ROM.
- 1st September 2003 -
Introduced the HelioViewer and
HelioCreator software programs and CD-ROM.
- 13th May 2003 - Added
pages on Solar Books and
Transits.
- 15th January 2002 -
Further information on the
McIntosh sunspot group classification given in the Glossary.
- 17th November 2001 -
Included new pages showing the
development of sunspots for some groups during 2000 and 2001.
- 25th February 2001 -
All disk animations for 2000
have been generated using jpg disk drawings.
- 11th February 2001 -
All disk drawings for 2000 are
in jpg format.
- 19th August 2000 - The
Sunspot Area page now includes
charts to derive the angular distance of a sunspot from the disk centre
to enable sunspot area to be calculated via an equation.
- 15th July 2000 - Helio
v2.0 has been issued - this
version includes a display for solar right ascension/declination, solar
altitude/azimuth and calculates sunspot areas. See the Software page to
download this program.
- 15th July 2000 - Helio
v1.2 has been issued. See the
Software page to download this program.
- 27th April 2000 - The
Helio program has been modified
to enable the date and time box sizes to be changed to accommodate
different windows date and time formats. The date can now be shown in
either the short or long formats.
- 25th April 2000 - A
new page - Sunspot Trends - has
been added to show the long term trends in the Sunspot Number and
Sunspot Area using smoothed data.
- 20th April 2000 - A
new page - Sunspot Numbers - has
been added to show the the sunspot number R derived from individual
drawings.
- 6th March 2000 - A new
plot has been added to the
Sunspot Measurements page to shows the northern and southern hemisphere
sunspot group numbers: one hemisphere can dominate activity for several
months before switching to the other hemisphere.
- 14th January 2000 -
Self extracting zip file included
for Helio v1.0 software.
- 8th January 2000 -
Launch of re-formated web site.
Last
updated on
28 September 2020.
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