These two methods work fine for my astronomical calculations. Maybe they'll be
inaccurate after 2100. Beats me. The world's going to end in 2012 anyway. ;)
@implementation NSDate (JulianDates)
- (NSTimeInterval)julianDate
{
return ([self timeIntervalSince1970] / 86400.0) + 2440587.50000;
}
+ (NSDate *)dateFromJulianDate:(NSTimeInterval)julianDate
{
NSTimeInterval seconds = (julianDate - 2440587.50000) * 86400.0;
return [NSDate dateWithTimeIntervalSince1970:seconds];
}
@end
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