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HM Nautical Almanac Office: News

Latest News

  • NavPac 4: Software Upgrade for Users of NavPac and Compact Data 2016-2020

    We are delighted to announce that we have released NavPac 4 as a free optional upgrade for existing registered NavPac and Compact Data 2016-2020 users. NavPac 4 can be used alongside NavPac 3.4, and NavPac 3.4 will continue to be supported until 2020.

    We strongly recommend users take advantage of the free upgrade as it provides a much improved user interface and several new tools and features designed to make Celestial Navigation easier for the Navigator.

    These include:

    • new Star Chart Displays in the Find It function,
    • a new feature called "Find Next" in the Sight Reduction function that calculates when and where a vessel will be for the next Sun rise/set/meridian Passage and Civil/Nautical/Astronomical Twilight based on the vessel's position, DR course and speed,
    • a night mode which makes NavPac convenient to use in situations which require the user to retain their night vision.

    For a full list of new features, and to obtain your copy of NavPac 4, please visit the NavPac 4 website.

  • New Royal Society paper on Earth Rotation

    A new paper by F.R. Stephenson, L.V. Morrison and C.Y. Hohenkerk, "Measurement of the Earth's rotation: 720 BC to AD 2015" in Proceedings of the Royal Society A 472 has been published presenting the most comprehensive assembly and analysis of historical data pertaining to the rotation of the Earth before the introduction of the Atomic Time scale in 1962. The paper can be downloaded from the DOI web site.

  • Crescent Moon Visibility for Ramadan and Eid al-Fitr 2016

    Information on the visibility of the new crescent moon for Ramadan and Eid al-Fitr 2016 is available for Mecca and a selection of locations across the United Kingdom for the New Moons of June 5th and July 4th.

  • UK Air Almanac 2016

    This latest version of the UK Air Almanac for 2016 is now available for download.

  • Crescent Moon Visibility for Ramadan and Eid al-Fitr 2015

    Information on the visibility of the new crescent moon for Ramadan and Eid al-Fitr 2015 is available for Mecca and a selection of locations across the United Kingdom for the New Moons of June 16th and July 16th.

  • NavPac 3.4.0

    This release of HMNAO's NavPac astro-navigation software for Windows can be found in the new edition of NavPac and Compact Data 2016-2020 due out at the end of March 2015. Please consult the NavPac page for further information.

  • Beta test version of Websurf

    An updated version of Websurf is available for testing. The interface has been completely revised with the intention of making it more user friendly. We would welcome any feedback on the improvements we have made.

  • Crescent Moon Visibility for Ramadan and Eid al-Fitr 2013

    Information on the visibility of the new crescent moon for Ramadan and Eid al-Fitr is available for Mecca and a selection of locations across the United Kingdom for the New Moons of July 8th and August 8th. Our new style of global crescent moon visibility maps are also provided.

  • Star Magnitudes file for NavPac 3.1.9

    The NavPac Status page was updated on March 11th 2013 to include a procedure for downloading a corrected star magnitudes file STARS3.dat.

  • The Explanatory Supplement to The Astronomical Almanac

    The revised third edition of this reference publication is available from University Science Books.

  • Ramadan 2012

    Visibility of the new crescent Moon and twilight information are provided for those visiting the Olympic Park in the period July 21st through to August 12th.

  • NavPac and Compact Data 2011-2015

    An update (v3.1.9) to the release version of Navpac (v3.1.6) is available as of 2011 December 6th to registered users. Please consult the NavPac page for further information.

  • UK Air Almanac 2012

    This publication has been made available as a free pdf download on 2011 September 20th.

  • The Queen's Official Birthday in 2012

    It has been confirmed that the Queen's Official Birthday will be held on 2012 June 16th and not 2012 June 9th as stated on our Astronomical and Calendarial Data Sheet for 2012 (Astronomical Information Sheet No.96). The original date of The Queen's Official Birthday nominally falls on the second Saturday of June. However, this date is subject to confirmation and in this case has been moved to the third Saturday of June.

  • Public Holiday for the Royal Wedding — 2011 April 29th

    On November 23rd 2010, it was announced (Hansard Vol. 519, No.77, p.142) that a public holiday will occur on April 29th, 2011 on the occasion of the marriage of HRH Prince William and Ms. Catherine Middleton. These arrangements have been confirmed for England, Wales and Scotland and it is expected that they will also apply to Northern Ireland.

  • NavPac and Compact Data 2011-2015

    An update (v3.1.8) to the release version of Navpac (v3.1.6) is available as of 2010 June 15th to registered users. Please consult the NavPac page for further information.

  • Queen's Diamond Jubilee Holiday

    On January 5th 2010, a statement on the Queen's Diamond Jubilee was made by the Secretary of State for Business, Innovation and Skills. It stated that the late May Bank Holiday on Monday May 28th 2012 will be moved forwards by one week to Monday June 4th 2012 and that Tuesday June 5th 2012 is to be declared a one-off bank holiday thus creating a four day break to celebrate the Queen's Diamond Jubilee. Although the announcement covers England and Wales, it is expected that these changes will also apply to Scotland and Northern Ireland.

  • Job Vacancy

    A job vacancy exists within HMNAO for a Mathematician / Astronomer. For more information and where to apply, please download the job outline. The closing date for applications is July 17th 2009.

  • St. Andrew's Day Holiday

    For users of HMNAO's Astronomical & Calendarial sheets, there is an addendum to the sheets for 2007 to 2012 inclusive in regard to the St. Andrew's Day Holiday introduced by the Scottish Executive earlier this year.

  • Crescent Moon Watch Project

    We would like to remind potential observers that our project to observe the new crescent moon is still running. We have experienced some difficulties with the e-mail system for advising observers of the date of the next new moon recently. The problem has now been resolved and we hope you will continue to make observations of the new crescent moon. We wish to apologise to our observers for these difficulties.

  • Relocation of HM Nautical Almanac Office

    HMNAO will be moving part of its infrastructure to the UK Hydrographic Office in Taunton at the beginning of December. If you wish to order data or discuss your requirements, please use the Taunton contact address and telephone numbers. E-mail should be forwarded to our new e-mail addresses automatically.

Older news items are available.

Publication dates for forthcoming Almanacs

This section gives the approximate publication dates for those editions of our almanacs which are in preparation.

Availability of 2018 edition(s):

Availability of 2019 edition(s):

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Last modified: Tuesday, 10 January 2017 at 09:23:16 GMT