I don't know the exact area of the HUDF images, and I wondered why I got an answer different from the "official" number of 12.7M, using an image size of 9 square arcminutes. At first I thought my slide rule skills were rusty. Kim ----- Original Message ----- From: John and Lisa Zeigler<mailto:john@johnstelescopes.com> To: 'Utah Astronomy'<mailto:utah-astronomy@mailman.xmission.com> Sent: Wednesday, March 30, 2005 8:42 AM Subject: RE: [Utah-astronomy] How's your math? Now since the HUDF imager is most likely slightly larger than a perfect 3 arc minutes on a side, Patrick's answer of the whole sky being 12.7 million times as large as a HUDF image seems very much in line to me. (Working the equation backwards, the HUDF would need to be 3.4 arc minutes on a side for 12.7 million images to cover the whole sky... Anyone know the exact size of a HUDF image?) John Zeigler