visée astrale

13:03 Feb 4, 2009
This question was closed without grading. Reason: Errant question

French to English translations [PRO]
Ships, Sailing, Maritime
French term or phrase: visée astrale
persicope de visée astrale
Local time: 02:22

Summary of answers provided
4star-sighting periscope (with built-in sextant)
Graham macLachlan
2sextant periscope
Tony M

Discussion entries: 2



7 mins   confidence: Answerer confidence 2/5Answerer confidence 2/5
periscope de visée astrale [PVA]
sextant periscope

Seems to get quite a few relevant Ghits, but not sure if it's the only / commonest term used.

Note added at 1 hr (2009-02-04 14:37:35 GMT)

Here's one Ghit that mentions a 'periscope sextant'

Blind Sailing - TIME

... of its inertial navigation gears, the Nautilus had one of the handiest wrinkles that submariners have developed since the snorkel—a periscope sextant. ...,9171,868736-2,00.html

Dual-view, immersible periscope - Patent 5526177

11 Jun 1996 ... Typical examples here include the rather lengthy telescoping submarine periscope and the compact sextant periscope for celestial navigation ...

Tony M
Local time: 02:22
Specializes in field
Native speaker of: Native in EnglishEnglish
PRO pts in category: 150

Peer comments on this answer (and responses from the answerer)
neutral  Graham macLachlan: Gimages gives us a type of sextant for your answer whereas the French term throws up a type of submarine telescope//yeah, I think we're probably talking about two sides of the same coin :)
1 hr
  -> Quite a number of the articles I found on Google describe it specifically in terms of a special periscope used for star sightings from subs (since 'ordinary' ones don't tilt up enough, I guess!) / Yup, Graham, I think so!
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1 hr   confidence: Answerer confidence 4/5Answerer confidence 4/5
star-sighting periscope (with built-in sextant)

Most references I came across talked about taking a sight through the periscope and not of a periscope specifically designed for sighting, bar this one:

Back in the old days the data that the NAVigation Electronic Technicians (NAVETs) recieved, primarily from a star sighting periscope or Navy Navigation ...

This one refers to a "built-in sextant":

At dawn on 17 February 1960, Triton performed its first morning star-sighting using the built-in sextant in its No. 1 periscope during the nightly ...

Most just refer to a periscope through which a star sight can be taken:

Before I move on, we used to try and get our messages at dawn or dusk, the skipper hoping that he could get a star sight fix through the periscope at the ... RADIO TRAFFIC FRO...

Note added at 3 hrs (2009-02-04 16:59:06 GMT)

The extract below leads me to think that 'our' sextant might be a bit out of date:

La navigation inertielle a conduit à créer et développer des technologies de pointe dans les domaines des gyroscopes et asservissements de très haute précision. Le périscope de visée astrale faisait appel aux ressources les plus ingénieuses de la mécanique, de l'optique et de l'informatique.

But this Ghit backs up Tony's answer to a certain degree:

Périscope de Visée Astrale, permet de faire le point par visée sur des étoiles (sextant périscopique).

Graham macLachlan
Local time: 02:22
Specializes in field
Native speaker of: Native in EnglishEnglish
PRO pts in category: 352
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