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The Jackson-Gwilt Medal is an award that has been issued by the Royal Astronomical Society (RAS) since 1897. The original criteria were for the invention, improvement, or development of astronomical instrumentation or techniques; for achievement in observational astronomy; or for achievement in research into the history of astronomy. From 2017 onwards, the history of astronomy category has been removed and transferred to a new award, the Agnes Mary Clerke Medal.
The frequency of the medal has varied over time. Initially it was irregular, with gaps of between three and five years between awards. From 1968 onwards it was awarded regularly every three years; from 2004 every two years; and since 2008 it has been awarded every year.
The award is named after Hannah Jackson née Gwilt. She was a niece of Joseph Gwilt (an architect and Fellow of the RAS) and daughter of George Gwilt (another Fellow); Hannah donated the original funds for the medal. It is the second oldest award issued by the RAS, after the Gold Medal. 
List of winnersEdit
- Webb, Annette. "Agnes Mary Clerke Medal for Historical Research in Astronomy or Geophysics". www.ras.org.uk. Retrieved 7 September 2017.
- Down, Emily. "Jackson-Gwilt Medal". www.ras.org.uk. Royal Astronomical Society. Retrieved 7 September 2017.
The Jackson-Gwilt Medal, after the Gold Medal the oldest offered by the Society, derives from a gift by Mrs Hannah Jackson-Gwilt, niece of the well-known architect and former fellow, Joseph Gwilt. She gave the Society a capital sum which was to be used after her death for the award of a medal and a cash prize.
- "Lists of Medallists, Prize Winners and Lecturers". www.ras.org.uk. Royal Astronomical Society.
- "The award of the Jackson-Gwilt Medal and Gift jointly to Mr F. M. Bateson and Mr A. F. A. L. Jones (address)". Quarterly Journal of the Royal Astronomical Society. 1: 27. 1960. Bibcode:1960QJRAS...1...27.
- "RAS honours leading astronomers and geophysicists". Royal Astronomical Society. Retrieved 16 August 2013.
- "2013 winners of the RAS awards, medals and prizes". Royal Astronomical Society. 10 January 2013. Archived from the original on 20 January 2013. Retrieved 13 January 2013.
- "Winners of the 2014 awards, medals and prizes - full details". Royal Astronomical Society. Archived from the original on 28 March 2014. Retrieved 19 March 2014.
- "2015 winners of the RAS awards, medals and prizes". Royal Astronomical Society. 9 January 2015. Archived from the original on 10 January 2015. Retrieved 9 January 2015.
- "RAS honours leading astronomers and geophysicist". RAS. 8 January 2015. Archived from the original on 20 July 2016. Retrieved 9 January 2015.
- Hollis, Morgan. "Winners of the 2017 awards, medals and prizes - full details". www.ras.org.uk. Royal Astronomical Society. Retrieved 15 September 2017.
- "List of winners" (PDF). ras.ac.uk. Retrieved 2020-10-18.
- "Citation for the 2019 RAS Jackson-‐Gwilt Medal:Professor Anna Scaife" (PDF). ras.ac.uk. Retrieved 2020-10-18.
- "Log in | The Royal Astronomical Society". ras.ac.uk.