Method: Suntrack::RAstro.to_mjd

Defined in:
lib/suntrack/RAstro.rb

.to_mjd(date_time) ⇒ Object

Utility method to convert Ruby DateTime to modified Julian date M&P, page 12



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# File 'lib/suntrack/RAstro.rb', line 64

def self.to_mjd(date_time)
  a = (10000 * date_time.year) + (100 * date_time.month) + date_time.mday
  m = date_time.month
  y = date_time.year
  if date_time.month <= 2
    m = date_time.month + 12
    y = date_time.year - 1
  end
  leapDays = (y/400).to_i - (y/100).to_i + (y/4).to_i
  if a <= 15821004.1
    leapDays = -2 + ((y+4716)/4).to_i - 1179
  end
  a = (365 * y) - 679004
  a + leapDays + (30.6001 * (m + 1)).to_i + date_time.mday + (Float(date_time.hour)/24) + (Float(date_time.min)/1440) + (Float(date_time.sec)/86400)
end