Timeline for Is there a precise definition of "Supermoon"?
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 10, 2021 at 0:04 | vote | accept | arivero | ||
| May 31, 2021 at 21:05 | comment | added | Ruslan | These sites seem to confuse brightness and illuminance due to the object. They might be applying the non-photometric sense of "brightness" (that's related to apparent magnitude) that's commonly used for point-like objects like stars. But it's misleading when used for non-point objects like the lunar disk, since you'll still see the same surface brightness while apparent magnitude will decrease. | |
| May 31, 2021 at 19:46 | comment | added | Stuart Robbins | @Ruslan - Every single source I have found for this says that my math is correct, including NASA (moon.nasa.gov/news/29/…), Space.com (space.com/22025-supermoon-2013-full-moon-myths.html), and TimeAndDate (timeanddate.com/astronomy/moon/super-full-moon.html). I looked there before I wrote it because I also wasn't entirely sure on that one. | |
| May 31, 2021 at 14:06 | comment | added | arivero | @steve average=384,399, super < 360,000, so diameter scales by atan(1737/360)/atan(1737/384) = 1.066, as said by Ruslan The 12-14% figure is for area, then | |
| May 31, 2021 at 10:19 | comment | added | stevec | +1 for quantifying. Is 12% bigger radius or diameter or surface area? | |
| May 31, 2021 at 8:42 | comment | added | Ruslan | Your brightness estimation is wrong. It would be correct it the Moon was bright due to the Earth, but no: its brightness is due to the Sun, from which the distance changes negligibly between Moon perigee and apogee. For a fixed illuminance of the Moon, its brightness will remain the same regardless of distance to the observer (Earth). What will change between perigee and apogee is the size of the lunar disk, and thus illuminance of Earth's surface by the Moon. The amount of this change is proportional to the change of lunar disk area, i.e. $\approx1.06^2-1$. | |
| May 31, 2021 at 1:56 | comment | added | Pierre Paquette | Thank you for giving the full story and correcting my figures. I answered out of memory and didn’t have much time before I had to leave. Sorry for the confusion. | |
| May 30, 2021 at 19:25 | history | edited | Stuart Robbins | CC BY-SA 4.0 |
deleted 2 characters in body
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| May 30, 2021 at 18:59 | history | answered | Stuart Robbins | CC BY-SA 4.0 |