Easter               package:fCalendar               R Documentation

_D_a_t_e _o_f _E_a_s_t_e_r

_D_e_s_c_r_i_p_t_i_o_n:

     Returns the date of Easter.

_U_s_a_g_e:

     Easter(year = currentYear, shift = 0)

_A_r_g_u_m_e_n_t_s:

    year: an integer value or integer vector for the year(s). 

   shift: an integer value, the number of days shifted from the Easter
          date. Negative integers are allowed. 

_D_e_t_a_i_l_s:

     Holidays may have two origins, ecclesiastical and public/federal. 
     The ecclesiastical calendars of Christian churches are based on 
     cycles of moveable and immoveable feasts. Christmas, December
     25th,  is the principal immoveable feast. Easter is the principal
     moveable  feast, and dates of most other moveable feasts are
     determined with  respect to Easter. 

     The date of Easter is evaluated by a complex procedure whose
     detailed  explanation goes beyond this description. The reason
     that the calculation  is so complicate is, because the date of
     Easter is linked to (an  inaccurate version of) the Hebrew
     calendar. But nevertheless a short  answer to the question "When
     is Easter?" is the following: Easter  Sunday is the first Sunday
     after the first full moon after vernal  equinox. For the long
     answer we refer to Toendering (1998).

     The algorithm computes the date of Easter based on the algorithm
     of  Oudin (1940). It is valid for any Gregorian Calendar year.

_V_a_l_u_e:

     returns the date of Easter as an object of class 'timeDate'.

_E_x_a_m_p_l_e_s:

     ## Easter -

        # Current Year:
        Easter()
        
        # From 2001 to 2010:
        Easter(2001:2010)

