Re: double blue moon
Hello all: Will two full moons always occur in a March that follows a Febuary with no full moon? John Carmichael Tucson The second March full moon this year occurs at 22:49 UT. Therefore, if one moves east from London by a couple of time zones March has but a single full moon this year (relative to the local standard time) and it is April that has two. This suggests to me that it is possible in other years for this to happen when measured against UT. 1999 Phases of the Moon Universal Time New MoonFirst QuarterFull Moon Last Quarter D H M D H M D H M D H M Jan. 2 02 49 Jan. 9 14 22 Jan. 17 15 46 Jan. 24 19 15 Jan. 31 16 06 Feb. 8 11 58 Feb. 16 06 39 Feb. 23 02 43 Mar. 2 06 58 Mar. 10 08 40 Mar. 17 18 48 Mar. 24 10 18 Mar. 31 22 49 Apr. 9 02 51 Apr. 16 04 22 Apr. 22 19 01 Apr. 30 14 55 May8 17 28 May 15 12 05 May 22 05 34 May 30 06 40 June 7 04 20 June 13 19 03 June 20 18 13 June 28 21 37 July 6 11 57 July 13 02 24 July 20 09 00 July 28 11 25 Aug. 4 17 27 Aug. 11 11 08 Aug. 19 01 47 Aug. 26 23 48 Sept. 2 22 17 Sept. 9 22 02 Sept. 17 20 06 Sept. 25 10 51 Oct. 2 04 02 Oct. 9 11 34 Oct. 17 15 00 Oct. 24 21 02 Oct. 31 12 04 Nov. 8 03 53 Nov. 16 09 03 Nov. 23 07 04 Nov. 29 23 18 Dec. 7 22 32 Dec. 16 00 50 Dec. 22 17 31 Dec. 29 14 04 http://aa.usno.navy.mil/AA/data/docs/MoonPhase.html Jim --- -- | Jim Cobb | 540 Arapeen Dr. #100 | [EMAIL PROTECTED] | | Parametric| Salt Lake City, UT | (801)-588-4632 | | Technology Corp. | 84108-1202 | Fax (801)-588-4650 | --- -- It is well to remember that the entire universe, with one trifling exception, is composed of others. -- John Andrew Holmes
Re: double blue moon
This reasoning relies on the mean length of a lunation. But the actual case is more complicated. See my reply to John on this same subject. Jim --- -- | Jim Cobb | 540 Arapeen Dr. #100 | [EMAIL PROTECTED] | | Parametric| Salt Lake City, UT | (801)-588-4632 | | Technology Corp. | 84108-1202 | Fax (801)-588-4650 | --- -- Gregor Samsa awoke one morning to find himself transformed into an enormous software defect. -- Hindin Joseph I think it pretty well follows. Consider the latest possible case, where a full moon falls late on January 31. February will have no full moon, even in a leap year, with a 29.5 day sidereal month. That puts the next full moon on either March 1st or 2nd, and the *next* full moon will fall on March 30 or 31. I:31/01 23:50 plus 29 12:00 60/01 35:50 corr 61/01 11:50 corr -31 (leap year) 30/02 11:50 30/02 11:50 corr -28 -29 II: 02/03 11:50 01/03 11:50 29 12:00 29 12:00 III: 31/03 23:50 30/03 23:50 If the first full moon falls earlier on January 31, the third one will still be within March... Dave
double blue moon
Hello all: Will two full moons always occur in a March that follows a Febuary with no full moon? John Carmichael Tucson
Re: Blue Moon
There was more about the blue moon as two full moons in the same month (incidentally it happens again this month). It was suggested that it was a reference to the practice of printers of diaries who thought it necessary to distinguish between the two full moons in the month by printing their full moon symbol on the appropriate days (nights?) in different colours, the extra one being blue. I think this is a load of tosh, but . Anyway, a whole month without any full moon at all, as last month, is much more interesting. Richard Crossley. Dept. of Physics, University of York, York YO10 5DD, England. E
Re: Blue Moon
Richard, There was more about the blue moon as two full moons in the same month (incidentally it happens again this month). It was suggested that it was a reference to the practice of printers of diaries who thought it necessary to distinguish between the two full moons in the month by printing their full moon symbol on the appropriate days (nights?) in different colours, the extra one being blue. I think this is a load of tosh, but . It does seem a lot of trouble to go to for what must be obvious. Anyway, a whole month without any full moon at all, as last month, is much more interesting. There has to be a name for this! If not, let it be known that henceforth it shall be - 'a blank moon(th)'. Wow - we've made history! :-) Tony Moss
Re: Blue Moon
The moon (and sun) can appear blue (or green) due to dust particles in the atmosphere following large volcanic explosions. Smoke from forest fires can produce a similar effect. Smoke from forest fires in Canada can reach Europe. One such fire in September 1950 produced smoke that caused blue moons to be seen in Europe. Tony, how old are you? Could this have been your event? -- Richard Langley Professor of Geodesy and Precision Navigation P.S. Source of info: The Stars Belong to Everyone by Prof. Helen Sawyer Hogg (a famous and much-loved Canadian astronomer (she passed away in 1993 at age 87). On Sat, 30 Jan 1999, Tony Moss wrote: Fellow Shadow Watchers, As a child I remember running into the house to say that the full moon looked blue in colour. Everyone laughed although nobody went outside to look for themselves. As I recall this was confirmed as a rare occurrence on the radio the following day much to my parents' surprise. Ever since then I've assumed that this was the origin of the saying 'once in a blue moon'. On TV yesterday I heard that we are about to witness a 'blue moon', explained as the rare occurrence of two full moons within one calendar month - nothing to do with colour at all. Was my experience just a childhood fantasy? Tony Moss === Richard B. LangleyE-mail: [EMAIL PROTECTED] Geodetic Research Laboratory Web: http://www.unb.ca/GGE/ Dept. of Geodesy and Geomatics EngineeringPhone:+1 506 453-5142 University of New Brunswick Fax: +1 506 453-4943 Fredericton, N.B., Canada E3B 5A3 Fredericton? Where's that? See: http://www.city.fredericton.nb.ca/ ===
Re: Blue Moon
Richard. One such fire in September 1950 produced smoke that caused blue moons to be seen in Europe. Tony, how old are you? Could this have been your event? -- Richard Langley Professor of Geodesy and Precision Navigation P.S. Source of info: The Stars Belong to Everyone by Prof. Helen Sawyer Hogg (a famous and much-loved Canadian astronomer (she passed away in 1993 at age 87). I was 12 years old in 1950 and consequently this rings a very loud bell. Without a doubt this was the blue moon I saw. - an explanation! - after all these years! Sincere thanks to you and the memory of the late Prof. Helen Sawyer Hogg. Tony Moss
