Time for a Lunar time zone?
On the lighter side; we may need to consider going interplanetary. https://theweek.com/space/1021396/why-space-experts-want-to-establish-a-luna... https://epaper.bostonglobe.com/infinity/article_popover_share.aspx?guid=8fcf... -- Tim McBrayer NOTICE from Ab Initio: This email (including any attachments) may contain information that is subject to confidentiality obligations or is legally privileged, and sender does not waive confidentiality or privilege. If received in error, please notify the sender, delete this email, and make no further use, disclosure, or distribution.
On 2023-03-01 04:18, Tim McBrayer via tz wrote:
On the lighter side; we may need to consider going interplanetary.
Is it interplanetary if it's just the Moon? I had thought that since the barycenter of the Earth–Moon system is under the surface of the Earth, the Moon doesn't count as a separate planet. Anyway, thanks for the heads-up; I installed the attached proposed patch to our already-existing section on time zones on other planets (a section that this patch renames).
On 2023-03-01 12:54, Paul Eggert via tz wrote:
On 2023-03-01 04:18, Tim McBrayer via tz wrote:
On the lighter side; we may need to consider going interplanetary.
Is it interplanetary if it's just the Moon? I had thought that since the barycenter of the Earth–Moon system is under the surface of the Earth, the Moon doesn't count as a separate planet.
Anyway, thanks for the heads-up; I installed the attached proposed patch to our already-existing section on time zones on other planets (a section that this patch renames).
They and we should look to Antarctica and Mars missions for prior art. -- Take care. Thanks, Brian Inglis Calgary, Alberta, Canada La perfection est atteinte Perfection is achieved non pas lorsqu'il n'y a plus rien à ajouter not when there is no more to add mais lorsqu'il n'y a plus rien à retirer but when there is no more to cut -- Antoine de Saint-Exupéry
Paul Eggert via tz said:
On 2023-03-01 04:18, Tim McBrayer via tz wrote:
On the lighter side; we may need to consider going interplanetary.
Is it interplanetary if it's just the Moon? I had thought that since the barycenter of the Earth???Moon system is under the surface of the Earth, the Moon doesn't count as a separate planet.
This is arguable. The barycentre is under the surface, yes, but if the Earth was denser it would be in the same place but that place would be outside it. Similarly, the Sun-Jupiter barycentre is outside the sun even though the barycentres for the other planets is inside. It seems an arbitrary definition. Also note that, as the moon drifts away from the earth under tidal braking, the barycentre will move outside the Earth. Does it become a separate planet at that point? An alternative approach is to look at the shape of the orbit. A typical satellite's orbit (say Titan) is always concave relative to the planet it orbits but sometimes convex relative to the sun. But our moon's orbit is different: it is always concave relative to the sun but, I think, can be convex relative to the earth. This is because the solar gravitational pull on the moon is more than twice the earth's pull. So the point at which the pulls are equal might make a reasonable definition. -- Clive D.W. Feather | If you lie to the compiler, Email: clive@davros.org | it will get its revenge. Web: http://www.davros.org | - Henry Spencer Mobile: +44 7973 377646
participants (4)
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Brian Inglis -
Clive D.W. Feather -
Paul Eggert -
Tim McBrayer