Index - D
| dayNumber | Data.Astro.Time.GregorianCalendar |
| dayOfWeek | Data.Astro.Time.JulianDate |
| DD | Data.Astro.Types, Data.Astro.Coordinate |
| DecimalDegrees | Data.Astro.Types, Data.Astro.Coordinate |
| DecimalHours | Data.Astro.Types, Data.Astro.Coordinate |
| DH | Data.Astro.Types, Data.Astro.Coordinate |
| dhToGST | Data.Astro.Time.Sidereal |
| dhToLST | Data.Astro.Time.Sidereal |