Return the Epact, which is a measure of the age of the moon (ie the number of days that have passed since an "official" new moon) on a particular date.Unit
QESBPCSDateTime
Declaration
Function GetEpact(const Year: Word): Integer;
Year | the Year to be processed - should be 4 digit, eg 1999. |
DT | the Date to be processed. |
Category
Date/Time Arithmetic Routines
Year Based Arithmetic Routines
Implementation
function GetEpact (const Year: Word): Integer;
var
Century: Integer;
begin
Century := Year div 100 + 1;
Result := ((11 * (GetGoldenNumber (Year) - 1)) mod 30
+ (8 * Century + 5) div 25) - (3 * Century) div 4 + 8;
while Result < 1 do
Result := Result + 30;
while Result > 30 do
Result := Result - 30;
End; |
Declaration
Function GetEpact(const Year: Integer): Integer;Implementation
function GetEpact (const Year: Integer): Integer;
var
Century: Integer;
begin
Century := Year div 100 + 1;
Result := ((11 * (GetGoldenNumber (Year) - 1)) mod 30
+ (8 * Century + 5) div 25) - (3 * Century) div 4 + 8;
while Result < 1 do
Result := Result + 30;
while Result > 30 do
Result := Result - 30;
End; |
Declaration
Function GetEpact(const DT: TDateTime): Integer;Implementation
function GetEpact (const DT: TDateTime): Integer;
begin
Result := GetEpact (Date2Year (DT));
End; |
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