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News on Websurf:
2010 January 13
Many changes have been made to the various programs including the implementation of the Sun, Moon and all planets for Rise_Set, Alt_Az, Az_at_Alt and Alt_at_Az options. Depression and Altitude options for Rise_Set and Az_at_Alt now work correctly. Crown Copyright statements have been included throughout the site. The INFO option now directs users to the relevant web sites and pages. Cosmetic changes have also been made to the codes.
2004 February 17
Changes have been made to the pages that implement location searching following comments from users that they were not clear. Efforts have been made to make it clear that one of the four options in the place search page should be used. A bug which allowed BST to be implemented for locations outside the UK has been corrected.
2003 May 14
A typographic error in the Alt_Az option has been found in the course of generating data for the Lunar eclipse on 2003 May 16. This typo caused errors in the computed altitudes of the Moon and has now been corrected. A small change in the refraction implemetation has also been made in the Almanac option. Refraction is applied in such a way as to provide altitudes compatible with the Rise_Set output.
2003 April 10
The PostScript file naming bug has been resolved in the Download Data option. PDF output can now be generated as well as PostScript output. The suggested filename will be the program option plus an extension of either .pdf or .ps. For instance, if you are running Rise_Set, the output file will either be Rise_Set.pdf or Rise_Set.ps.
2003 April 1
Websurf released. There may be problems in the naming of PostScript files when data are saved using the Download Data option. The files may be named runsurf.cgi but they are PostScript files not cgi programs. This cause of this bug is being investigated.
2003 March 31
Almanac option released. This option provides topocentric solar, lunar and planetary data for a specified location at a given date and time. It uses local standard time for input but does not include a summer time or daylight saving time option. Any date between 1600 January 1 and 2200 December 31 can be entered.
2003 March 7
Equ_&_Sol option released. This option provides the date and time of the Equinoxes and Solstices for a particular year. A time zone can be specified to generate the data in local standard time. No correction is made for summer time or daylight saving time. Any date between 1600 January 1 and 2200 December 31 can be entered.
2003 March 7
Moon_Phase option released. This option provides the next four Moon phases aftera specified date or the phases for the full year if only the year is specified. A time zone can be specified to generate the data in local standard time. No correction is made for summer time or daylight saving time. Any date between 1600 January 1 and 2200 December 31 can be entered.
2003 February 19
UK Postcode option released. The location for which data are required can now be specified using a UK postcode.
2003 February 19
Existing fortran software has been upgraded to use the Jet Propulsion Laboratory's DE405 ephemeris. This will provide data for a period of 600 years.
2003 January 6
Updates being implemented to update the existing Websurf service designed for use on the Web by David Harper. The underlying software is fortran code used for many years by the Public Information Unit of the Royal Greenwich Observatory.
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Websurf is a service of H.M. Nautical Almanac Office.
© Crown Copyright 2010