DENVER - Picking a winner of the presidential contest is front and center at what's being billed as the largest astrologers' convention in years.

More than 1,500 astrologers from 45 countries have descended on Denver, site of the Democratic National Convention in August, for the "United Astrology Conference: Rockin' the Universe."

The gathering concludes Tuesday with a panel predicting a presidential winner in November.

Key to those picks: Astrological charts for John McCain, Barack Obama and Hillary Rodham Clinton. And integral to those charts: The candidates' exact birth times.

The astrologers have learned -- after much effort -- that Obama was born Aug. 4, 1961, at 7:11 p.m.; and McCain on Aug. 29, 1936, at 11 a.m. But Clinton's birth time remains a moving target.

Astrologer Shelley Ackerman and others insist their profession's work is as accurate, if not more so, than many polls. They note pollsters wrongly predicted Obama winning New Hampshire's Democratic primary.

"With astrology, I guess, there's just more to it," Ackerman said.

Ackerman declined to reveal her pick for president. But she did say Sen. Joe Biden, D-Del., and former Massachusetts Gov. Mitt Romney are top Democratic and Republican vice presidential hopefuls, based on their charts.