Editing Box Tunnel (section)

==Brunel's birthday==

[[File:GWR BoxTunnel 05.jpg|thumb|The sun rises in near alignment to the entrance to Box Tunnel, Bath, UK on 9 April 2017]]
[[Great Western Railway (train operating company)|GWR franchise]] rebutted the theory that the rising sun passed through the tunnel on Isambard Brunel's 9 April birthday, finding in 2017 that the sunrise did not shine fully through the tunnel. Librarian C.P. Atkins calculated in 1985 that full illumination through Box Tunnel would occur on 7 April in non-Leap years and on 6 April in Leap years.<ref>{{cite journal |author=Atkins, C.P. |title= Box Railway Tunnel and I. K. Brunel's Birthday: A Theoretical Investigation |journal=Journal of the British Astronomical Association|volume = 95 |issue=6 |pages = 260–262|bibcode = 1985JBAA...95..260A|year = 1985}}</ref> The [[Society of Genealogists]] in 2016 suggested the sun shone through the tunnel on 6 April, the birthday of Brunel's sister, Emma Joan Brunel, three years out of four during the 1830s.{{citation needed|date=November 2020}}<ref>{{Cite web |url=http://www.mirlibooks.com/isambards-gift.html |title=Isambard's Gift |website=Mirli Books |access-date=25 May 2017}}</ref>

{{anchor|Cold War}}