Pierre, Paul Rittman sirs: >A number you may find useful is 206264.8. Is this value for Pi used anywhere in day-to-day life. Any reference avaialable. Most enineering/standard reference books maintain and use the Radian value of 57* 17' 44".88 (57*.2958), which deviate by 0.08 from this value. I arrived at this value on examining 'MOST known values for Pi' and arrive at a Rationalised approach of Pi =100000/31831 which also define the Radian as (57*2958) =57* 17' 44"88. This squarely fit most astronomical calculations. Please see: http://www.brijvij.com/bb_rationalisedPi-value.pdf Regards, Brij Bhushan Vij Sunday, 20110403H13:54(decimal)EST Aa Nau Bhadra Kritvo Yantu Vishwatah -Rg Veda The Astronomical Poem (revised number of days in any month) "30 days has July,September, April, June, November and December all the rest have 31 except February which has 29 except on years divisible evenly by 4; except when YEAR divisible by 128 and 3200 - as long as you remember that "October (meaning 8) is the 10th month; and December (meaning 10) is the 12th BUT has 30 days & ONE OUTSIDE of calendar-format" Jan:31; Feb:29; Mar:31; Apr:30; May:31; Jun:30 Jul:30; Aug:31; Sep:30; Oct:31; Nov:30; Dec:30 (365th day of Year is World Day) ******As per Kali V-GRhymeCalendaar***** "Koi bhi cheshtha vayarth nahin hoti, purshaarth karne mein hai" My Profile - http://www.brijvij.com/bbv_2col-vipBrief.pdf Author had NO interaction with The World Calendar Association except via Media & Organisations to who I contributed for A Possible World Calendar, since 1971. HOME PAGE: http://www.brijvij.com/ Contact via E-mail: [email protected]
> From: [email protected] > To: [email protected] > Subject: [USMA:50260] Re: Astronomical measurements > Date: Sun, 3 Apr 2011 00:33:51 -0400 > > On Saturday 02 April 2011 20:36:43 Paul Rittman wrote: > > So would you folks advise (1) being purist, and quoting > > inter-stellar distances as “ultra-giga-multi-meters” or whatever; (2) in > > parsecs, which is almost entirely unknown to civilians; or (3) stick with > > the term “light-year”? And just as importantly, why? > > Prefixes are used with the meter, of course, and also with the parsec. I'm > not > sure if they're used with the light-year. > > Of those units, direct measurements are possible only in parsecs (by waiting > six months and seeing how many arcseconds the star appears to move). I've > heard of astronomers measuring in milliarcseconds, so kiloparsecs should be > doable this way, but not megaparsecs. Red-shift measurements have to be > converted, whatever units they are converted to. > > I think the general public would need an explanation of whatever units are > used. I suggest giving a few distances in all three units, in case the > audience is not all familiar with the same unit, and then using petameters, > exameters, etc. for the rest. The public may not be familiar with those big > prefixes either. > > A number you may find useful is 206264.8. It's the number of arcseconds > (approximately) in a radian; multiply an astronomical unit by that and you > get a parsec. I use the number occasionally in surveying. The mantissa of its > reciprocal is 4848137; I use the three 48s to check whether I remember the > number correctly. > > Pierre > -- > When a barnacle settles down, its brain disintegrates. > Já não percebe nada, já não percebe nada. >
