منبع: سایت کمان آسمانی
Dear Alireza -
Thank you for your message. Congratulations on the increasingly successful sightings that one reads on the ICOP page. For better or worse I am in a climate now where it is not worth making the effort (east coast USA). So I am not participating now unless I eventually get a job in the SW of USA, e.g. Arizona, where it is possible to do excellent sighting. I fully agree with the using Yallop and believe that the SAAO analysis would be consistent with Yallop; just uses some more inputs (from myself and ICOP) and used some different parameters. The 3-zone method seems like a sociologically good idea, as long as the actual visibility within a zone is understood to vary (a) north-to-south sometimes and (b) east-to-west most times, by a large factor similar to the differences from zone-center to zone-center. At some time, with the accumulated (by consensus valid) ICOP results, a reanalysis for the Yallop--visibility boundaries and SAAO-visibility-boundaries would be interesting (mostly a question of clarifying the behavior in the large delta-azimuth gaps).
However the accumulation or results *near the marginal lines* is fairly slow, and much of the world has predominantly mediocre conditions.
My address follows. I used to be at the SAAO Cape Town and then for a year at Heidelberg, Germany.
May 2003 be a year of a return to peace and reason and respect (for all prophets and peoples).
John A.R. Caldwell
Space Telescope Science Inst.
Whit greetings from Esfahan!
We will have tree observations of Moon Crescent during the coming Iranian year (beginning on March 21, 2003). The first will take place on April 2nd, 2003. In attached map no. 1 I have drawn the visibility line of the crescent. The red line is the criterion of SAAO; and the blue line is the criterion of Yallop. We are trying to settle at least two groups in the zones within the two above-mentioned lines. We will have the same situation on January 22nd, 2004. The attached map no. 2 indicates the location. These two crescents are evening/young crescents. In the dawn of August 27th, 2003, we will have a morning/old crescent whose negative age in Esfahan zone during the sunrise is -15 hours and 23 minutes. The crescent will rise 43 minutes before the sun. We may go to the west part of Iran to reduce the negative age as much as possible.
I hope to give you good news on these observations.
نمودار شماره 2 نمودار شماره 1
Khlid Shaukat wrote:
Thanks Brother Alireza, for including me in your e-mail.
Good Luck for you efforts.
With my criteria, the Jan 21, 2004 sighting would be almost impossible from Esfahan, but let us see what happens.
The morning crescent would be easiest from Esfahan although the age is smallest among the three you mentioned.
Keep me posted with your observation.
For your information, I am attaching my calculations for the three cases for Esfahan.
Esfahan IRAN TZ= 4.5 LATITUDE= 32:41N LONGITUDE= 51:41E
NEWMOON:APR 1, 2003(TUE)19:18UT AFS3.85 < Moon's Position at time of Sunset >
SFR 1424 Moon GC. AFS HDFS TC. Cresc Cresc
Vis International Sunset Lag Moonset Age Alt ARCL DAZ Alt Width Horns
Prb Date Day Hr:Mn Hr:Mn Hr:Mn Hrs Deg Deg Deg Deg arcmn Shape
TS APR 2, 2003(WED) 19:24 0:36 20:00 19.6 7.4 9.5 4.8S 6.4 0.20 3- 7
Moon-Earth Distance= 1.054458 Units (Min.=0.927 Max.=1.058)
Sun-Earth Distance= .999564058343026 A.U. (Min.=0.9832 Max.=1.01676)
Esfahan IRAN TZ= 3.5 LATITUDE= 32:41N LONGITUDE= 51:41E
NEWMOON:JAN 21, 2004(WED)21:05UT AFS4.82 < Moon's Position at time of Sunset >
ZHJ 1424 Moon GC. AFS HDFS TC. Cresc Cresc
JAN 22, 2004(THU) 17:26 0:34 17:59 16.9 6.1 10.7 8.2S 5.0 0.28 2- 6
Moon-Earth Distance= .9586714 Units (Min.=0.927 Max.=1.058)
Sun-Earth Distance= .9841213919972193 A.U. (Min.=0.9832 Max.=1.01676)
NEWMOON:AUG 27, 2003(WED)17:26UT AFS4.94 < Moon's Position at time of Sunrise >
End of Jumada-I 1424 Moon GC. AFS HDFS TC. Cresc Cresc
Vis International Sunrise Lag Moonrise Age Alt ARCL DAZ Alt Width Horns
VP AUG 27, 2003(WED) 6:34 0:43 5:52 -15.4 8.2 9.6 3.2S 7.1 0.22 9- 1
Moon-Earth Distance= .9844078 Units (Min.=0.927 Max.=1.058)
Sun-Earth Distance= 1.010506664527601 A.U. (Min.=0.9832 Max.=1.01676)
VP=Visible by naked eye if perfect conditions
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