Comments on: Ep. 113: The Moon, Part 1

By: Ajay A Farse

Ajay A Farse — Tue, 17 Mar 2009 14:25:50 +0000

hi i am ajay i like geography

By: geojim56

geojim56 — Thu, 18 Dec 2008 01:27:37 +0000

Radiocarbon has no relevance to dating on the Moon. The link should be removed.

By: Jack MacDonald

Jack MacDonald — Sun, 16 Nov 2008 04:04:44 +0000

I was commuting to work on Nov 14 about 6:15 am and noticed a nearly-full moon near the horizon and a high tide. Seems about 6 h different than the explanation given on the episode.

For Fraser: I am sure you know the location where I made the observation. Deas Slough near the Massey Tunnel in Vancouver.

Great show! Especially appreciated the explanation of why the same side of the moon always faces the earth. Always wondered about that one!

By: Mark Mulkerin

Mark Mulkerin — Wed, 12 Nov 2008 01:28:39 +0000

Great show. I have one question about tides though. Does tidal pull affect the relative depth of groundwater? Thanks.

By: Olof

Olof — Sun, 09 Nov 2008 18:11:56 +0000

Actually tides are a bit misrepresented on the show: You can not simply sit on the beach and observe that the moon is high when you have a high tide.

Complicating factors:
1. The presence of continents.
2. The depth of the ocean. This limits how fast a wave can travel across the globe. Our oceans are too shallow allow for a tidal bulge moving in phase with the moon.
3. Coriolis force, which deflects the tidal currents.
4. Resonance.

If you compare tidal charts you will notice that the tide is not necessarily in phase with the moon or sun, but that the period is correct.

Cheers,
Olof
Oceanographer