@BioHospitalix Le méridien de longitude 0 est rigoureusement le méridien de référence international, défini par convention, et différant du méridien de Greenwich. Papier sur le sujet : https://t.co/Hh3vnVHU0W
The historian meridian marker In Greenwich is off by about 100 meters because they looked "straight up" at stars, but to find "straight up" you use a weight to find "straight down", and the uneven mass of the Earth means that it doesn't point to the exa...
@leifwalsh @geofft It looks like yes, every true meridian must pass through the center of mass, but the original Greenwich meridian did not, because local mass distribution gives a Greenwich vertical which is canted a bit. https://t.co/3OvshCmiN3 has a lot
@beckyfh When they propose to "let Greenwich be Greenwich" (i.e., to move it back for UK time) then I'll know they're truly dotty. https://t.co/5RFWqXJh83
Thanks to everyone who came to my @emfcamp talk today. I'll post links to slides and videos in the next few days. For anyone interested in the paper about the IERS Meridian vs Prime Meridian, here's the definitive paper. https://t.co/pJVpW7SWzv
@TheRealistHom Maybe Earth slightly favors France, because the prime meridian has moved east a little. https://t.co/HywrrzrQd6
RT @gentsemane: 277. Posisi garis meridian utama (bujur 0°) menurut Observatorium Greenwich (putus-putus, kiri) tidak sama dengan posisi me…
RT @gentsemane: 277. Posisi garis meridian utama (bujur 0°) menurut Observatorium Greenwich (putus-putus, kiri) tidak sama dengan posisi me…
277. Posisi garis meridian utama (bujur 0°) menurut Observatorium Greenwich (putus-putus, kiri) tidak sama dengan posisi meridian utama menurut sistem GPS yang kita pakai sehari-hari (garis lurus, kanan). Keduanya terpisah sekitar 102 meter. 🌐🌍🛰️ https://
RT @JurgenKusche: If you're teaching in geosciences, you will have mentioned the Greenwich meridian at some point. Why the meridian *not* e…
RT @JurgenKusche: If you're teaching in geosciences, you will have mentioned the Greenwich meridian at some point. Why the meridian *not* e…
RT @JurgenKusche: If you're teaching in geosciences, you will have mentioned the Greenwich meridian at some point. Why the meridian *not* e…
RT @JurgenKusche: If you're teaching in geosciences, you will have mentioned the Greenwich meridian at some point. Why the meridian *not* e…
RT @JurgenKusche: If you're teaching in geosciences, you will have mentioned the Greenwich meridian at some point. Why the meridian *not* e…
RT @JurgenKusche: If you're teaching in geosciences, you will have mentioned the Greenwich meridian at some point. Why the meridian *not* e…
RT @JurgenKusche: If you're teaching in geosciences, you will have mentioned the Greenwich meridian at some point. Why the meridian *not* e…
RT @JurgenKusche: If you're teaching in geosciences, you will have mentioned the Greenwich meridian at some point. Why the meridian *not* e…
RT @JurgenKusche: If you're teaching in geosciences, you will have mentioned the Greenwich meridian at some point. Why the meridian *not* e…
RT @JurgenKusche: If you're teaching in geosciences, you will have mentioned the Greenwich meridian at some point. Why the meridian *not* e…
RT @JurgenKusche: If you're teaching in geosciences, you will have mentioned the Greenwich meridian at some point. Why the meridian *not* e…
RT @JurgenKusche: If you're teaching in geosciences, you will have mentioned the Greenwich meridian at some point. Why the meridian *not* e…
RT @JurgenKusche: If you're teaching in geosciences, you will have mentioned the Greenwich meridian at some point. Why the meridian *not* e…
RT @JurgenKusche: If you're teaching in geosciences, you will have mentioned the Greenwich meridian at some point. Why the meridian *not* e…
RT @JurgenKusche: If you're teaching in geosciences, you will have mentioned the Greenwich meridian at some point. Why the meridian *not* e…
RT @JurgenKusche: If you're teaching in geosciences, you will have mentioned the Greenwich meridian at some point. Why the meridian *not* e…
RT @JurgenKusche: If you're teaching in geosciences, you will have mentioned the Greenwich meridian at some point. Why the meridian *not* e…
Why the Greenwich meridian moved ?
If you're teaching in geosciences, you will have mentioned the Greenwich meridian at some point. Why the meridian *not* exactly runs through the observatory is explained in Stephen Malys et al paper (https://t.co/fF6fqcSa6R) - most downloaded paper ever in
RT @SaveStandard: @physicsJ Thanks for this history reminder! Here's another article explaining why many meridians (not just the prime one)…
RT @SaveStandard: @physicsJ Thanks for this history reminder! Here's another article explaining why many meridians (not just the prime one)…
RT @SaveStandard: @physicsJ Thanks for this history reminder! Here's another article explaining why many meridians (not just the prime one)…
@physicsJ Thanks for this history reminder! Here's another article explaining why many meridians (not just the prime one) were shifted in 1984 (in short, it's the difference between astronomical and geodetic coordinates). https://t.co/bve4HAQUib
This article explains the situation: https://t.co/mYuBG6CsJO "The imposed condition of continuity in astronomical time". There you go. https://t.co/UzipDW8hOh
@AstroKatie @ROGreenwich Hmm that’s not quite zero longitude: https://t.co/UL122L9tVZ
@kawulf Turns out it’s about 102 m east; see https://t.co/473JALpAOg (or check out the history of the prime meridian in the epilogue of my book on the subject, https://t.co/xCqcvKy35a or https://t.co/5bO0dqLttV (154 MB)). Enjoy your trip to London!
Wish this was available when I was taking my reference systems class with Prof. Werner Kuhn @ifgi https://t.co/pStTRabJVr
RT @propella: 経度ゼロがグリニッジからズレている件。 https://t.co/JU5HroOFhX を読むと世界時を維持しつつ天文経度から地理経度に切り替えた差と理解した。しかしネットで検索しても世界時に触れた記事が他に無く自信が無い。
RT @propella: 経度ゼロがグリニッジからズレている件。 https://t.co/JU5HroOFhX を読むと世界時を維持しつつ天文経度から地理経度に切り替えた差と理解した。しかしネットで検索しても世界時に触れた記事が他に無く自信が無い。
RT @propella: 経度ゼロがグリニッジからズレている件。 https://t.co/JU5HroOFhX を読むと世界時を維持しつつ天文経度から地理経度に切り替えた差と理解した。しかしネットで検索しても世界時に触れた記事が他に無く自信が無い。
経度ゼロがグリニッジからズレている件。 https://t.co/JU5HroOFhX を読むと世界時を維持しつつ天文経度から地理経度に切り替えた差と理解した。しかしネットで検索しても世界時に触れた記事が他に無く自信が無い。
@btreguier et donc, voilà : https://t.co/j4MWdD4zFv
@btreguier c'est l'IGN qui m'a donné ces explications alors que je m'étonnais que la position GPS du méridien de Paris (qui ne passe pas très loin de chez moi) ne correspondait pas exactement à celle "historique" indiquée par l'IGN. https://t.co/qGT8pM00m9
Why is the Greenwich meridian 102 meters away from Greenwich Observatory? It's all about the difference between modern geodesy and astronomy. https://t.co/yivIcTPVmf
Le moment où je découvre (après avoir cherché la position exacte du méridien de Paris) que 2 de mes dadas, le repérage cartographique et la mesure du temps, sont beaucoup plus intimement liés que je pensais. (merci @IGNFrance) https://t.co/qGT8pM00m9
@pbeyssac [2/2] (...) Malgré décalage zéro original et actuel , l'orientation plan méridien utilisé pour TU reste inchangée. Avec, en bonus, une suggestion de lecture (en anglais) : https://t.co/Tqrk4lIxXx
@shenmaxiu @KORZING @emirhartato A good read to learn more about "errors" in the GPS datum https://t.co/gGtJ4mXufO #spaceandtime https://t.co/UAXJa6YF5W
@AscendingNode Evidently? 🤔 https://t.co/uhN3Wz1j9w
RT @AtheistEngineer: @hollyhaygood @Golden7586 @Reid_CO @Helena_Sindelar @theism_sucks Have you ever seen a scientific journal article, Hol…
@hollyhaygood @Golden7586 @Reid_CO @Helena_Sindelar @theism_sucks Have you ever seen a scientific journal article, Holly? This is what real science looks like: https://t.co/PhDFwjWOVI
@nosemiquavers @standupmaths @Dr_Lucie @tomscott Interesting article on the 102m difference: https://t.co/dCrHQsxpV5
@HistAstro Difference is mainly due to difference between astronomical and geodetic coordinates, not technology. See https://t.co/KXQKnMC1kR
Hey! Good people of #Greenwich, you moved? Why the Greenwich meridian moved | SpringerLink - https://t.co/DYzV6UwGqc https://t.co/sgN5f4dflf
RT @CordwainersCat: @sitesirius ちゃんと理解するにはこの論文を読まないと分からないのでしょうね。幸いな事にオープンアクセス。しかし、読むのはマンドクサイ。任せたw https://t.co/AVMfzAuXKy
@sitesirius ちゃんと理解するにはこの論文を読まないと分からないのでしょうね。幸いな事にオープンアクセス。しかし、読むのはマンドクサイ。任せたw https://t.co/AVMfzAuXKy
Why the Greenwich meridian moved -- https://t.co/F01QTNRDis #springerlink
RT @AustinCapsey: "Why The Greenwich Meridian Moved" in the media this week, read the original paper in the Journal of Geodesy here: http:/…
.@srmdrummer Nice story and original article if anyone wants to dig into the geodesy too http://t.co/mFNBzweGjU
RT @TeraKen0510: グリニッジ天文台を通る基準となる子午線が「100m移動」したこと、知らなかった(⦿_⦿)>> http://t.co/cJoGJo6FfQ
RT @TeraKen0510: グリニッジ天文台を通る基準となる子午線が「100m移動」したこと、知らなかった(⦿_⦿)>> http://t.co/cJoGJo6FfQ
RT @TeraKen0510: グリニッジ天文台を通る基準となる子午線が「100m移動」したこと、知らなかった(⦿_⦿)>> http://t.co/cJoGJo6FfQ
RT @TeraKen0510: グリニッジ天文台を通る基準となる子午線が「100m移動」したこと、知らなかった(⦿_⦿)>> http://t.co/cJoGJo6FfQ
RT @TeraKen0510: グリニッジ天文台を通る基準となる子午線が「100m移動」したこと、知らなかった(⦿_⦿)>> http://t.co/cJoGJo6FfQ
RT @TeraKen0510: グリニッジ天文台を通る基準となる子午線が「100m移動」したこと、知らなかった(⦿_⦿)>> http://t.co/cJoGJo6FfQ
RT @TeraKen0510: グリニッジ天文台を通る基準となる子午線が「100m移動」したこと、知らなかった(⦿_⦿)>> http://t.co/cJoGJo6FfQ
RT @TeraKen0510: グリニッジ天文台を通る基準となる子午線が「100m移動」したこと、知らなかった(⦿_⦿)>> http://t.co/cJoGJo6FfQ
( ; ゜Д゜) RT @TeraKen0510: グリニッジ天文台を通る基準となる子午線が「100m移動」したこと、知らなかった(⦿_⦿)>> http://t.co/grznGozCiX
グリニッジ天文台を通る基準となる子午線が「100m移動」したこと、知らなかった(⦿_⦿)>> http://t.co/cJoGJo6FfQ
グリニッジ子午線(点線)とIERS基準子午線(実線) グリニッジ子午線が「100m移動」したのはなぜか « WIRED.jp http://t.co/44U2xX985X http://t.co/L2lE68wSQj http://t.co/em9QK1lUOm
Why is the true meridian 102m east of the marker at Greenwich? Due to difference btw astronomical & geodetic coords: http://t.co/WY55cF57dh
RT @gpazymino: The Greenwich meridian moved 102 meters East, why? http://t.co/3b0m9JG6UZ http://t.co/5tGuGHOpnh
@pekingspring @ConversationUK Go straight to the original http://t.co/3lSNoUJnwT (not read yet, but I think it makes valid point!)
Why the Greenwich meridian moved http://t.co/BBiICgxvAA #springerlink
"Why The Greenwich Meridian Moved" in the media this week, read the original paper in the Journal of Geodesy here: http://t.co/TJkkDcSPsT
Why the Greenwich meridian moved http://t.co/z3BLaJlr2e
That pesky Victorian mercury... http://t.co/roGj5GDqNL
The Greenwich meridian moved 102 meters East, why? http://t.co/3b0m9JG6UZ http://t.co/5tGuGHOpnh
RT @fatmike182: Der #Greenwich-Meridian geht 102m am 0-Meridian vorbei. Forscher rechnen nach, warum das so ist: http://t.co/Qmqk5h9n1P c @…
Der #Greenwich-Meridian geht 102m am 0-Meridian vorbei. Forscher rechnen nach, warum das so ist: http://t.co/Qmqk5h9n1P c @thomas_mohr #geo
@dhhayling Sadly @tomscott is wrong - see more detailed discussion at http://t.co/oce1x9aAih
Forgive me but here is a really deep dive into the history of time zones and the establishment of GMT. #BackToSchool http://t.co/MkjIXR22S8
Why the Greenwich meridian moved 102 meters http://t.co/tcBMOYEGqu
I'm reading Why the Greenwich meridian moved http://t.co/450Ni3YjmC #springerlink
I'm reading Why the Greenwich meridian moved http://t.co/wWNSjGClXL #springerlink
Why the Greenwich meridian moved: http://t.co/Ny17bERfhU
Why the Greenwich meridian moved http://t.co/oKttDw91kQ
Explanation why #Greenwich meridian moved in Journal of Geodesy http://t.co/UH3xC7zRTZ http://t.co/5pzPS6cG2I
"Why the Greenwich meridian moved" Time as you know it—it's wrong #lostintime #lostinspace http://t.co/o9t1dj0JGb
RT @IanHall_CU: The Greenwich meridian has moved 102m east (astronomical vs geodetic) http://t.co/jMyKEVRDe2 http://t.co/fXj0nhaMBL http://…
RT @fanf: http://t.co/oce1x9aAih - Why the Greenwich meridian moved.
http://t.co/oce1x9aAih - Why the Greenwich meridian moved.
The Greenwich meridian has moved 102m east (astronomical vs geodetic) http://t.co/jMyKEVRDe2 http://t.co/fXj0nhaMBL http://t.co/xMUyVqORc9
Der #Nullmeridian in #Greenwich liegt um 102 m daneben?! "Why the Greenwich meridian moved" http://t.co/gAHjG0agrU #GPS #VDV
Why the Greenwich meridian moved - pdf whitepaper http://t.co/Tvh5omiafO #springerlink
It's due to improvements in GPS technology. The full #openaccess paper explaining is free to read here: http://t.co/QbvjMu2Gjx
RT @paulcoxon: It's due to improvements in GPS technology. The full #openaccess paper explaining is free to read here: http://t.co/QbvjMu2G…
It's due to improvements in GPS technology. The full #openaccess paper explaining is free to read here: http://t.co/QbvjMu2Gjx
It's due to improvements in GPS technology. The full #openaccess paper explaining is free to read here: http://t.co/QbvjMu2Gjx
It's due to improvements in GPS technology. The full #openaccess paper explaining is free to read here: http://t.co/QbvjMu2Gjx