[Leica] IMG: 5 minutes into nautical twilight on the 13th April at Seapoint, Co Dublin
Douglas Barry
imra at iol.ie
Sat Apr 16 15:24:14 PDT 2022
In ordinary twilight, most of us can see fairly well without artificial
light, but as the sun dips further, light is needed, however, it's still
possible to discern the horizon, so that is nautical twilight. When the
horizon disappears due to darkness, then it's impossible for a sailor to
navigate using a sextant, hence the end of nautical twilight.
Nowadays, most modern sextants have a built in artificial horizon, but
the one I have here which my Dad bought second hand in the 1920s and was
used by him when he was a ship's officer, doesn't. It's probably from
the 1890s.
Thanks to all who looked and commented at the photo, despite its flaws,
but I'm definitely bringing a baby tripod with me the next time.
Douglas
On 16/04/2022 14:39, Nathan Wajsman wrote:
> Nice view—but what exactly does “nautical twilight” mean? How is it different from just plain twilight?
>
> Cheers,
> Nathan
>
> Nathan Wajsman
> photo at frozenlight.eu
>
> http://www.fotocycle.dk/paws
> http://www.greatpix.eu
> http://www.frozenlight.eu
>
> YNWA
>
>
>
>
>> On 14 Apr 2022, at 02:40, Douglas Barry <imra at iol.ie> wrote:
>>
>> As a warm front has swept in over Ireland, I went out in the twilight after sunset for a stroll with a camera in my pocket, and, at about 30 minutes after the sun went down, nautical twilight began. I hadn't brought a mini tripod, so this 5 second exposure was done on a flat bit of railing.
>>
>> Nautical twilight beside the sea at Seapoint, Co. Dublin.
>>
>> http://gallery.leica-users.org/v/DouglasBray/5+mininutes+into+nautical+twilight+on+the+13th+April+at+Seapoint_+Co+Dublin.jpg.html
>>
>> Fuji X100S. Can be seen larger.
>>
>> Douglas
>>
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