Here I list the sacrifice dates for the Ogam wheel.
'/' indicates a choice of sacrifice (either u- or u+) and
',' indications that both sacrifices should be made 
(one is a Saltus luna sacrifice).

In tree calendar leap years the sacrifice near
the tree calendar leap day is cancelled. 
The exact leap day rule is not known.

Golden BIRCH ALDER HAWTH HOLLY VINE  ELDER
 #1      1    4/6   7/9  10/12 13/15 18/20
 #2    18/20 23/25 26/28   1    2/4   7/9
 #3     7/9  12/14 15/17 18/20 21/23 26/28
 #4    26,27   2    3/5   6/8   9/11 14/16
 #5    14/16 19/21 22/24 25/27   28   3/5
 #6     3/5   8/10 11/13 14/16 17/19 22/24
 #7    22/24   27    2    3/5   6/8  11/13
 #8    11/13 16/18 19/21 22/24 25/27   2
 #9      2    5/7   8/10 11/13 14/16 19/21
#10    19/21 24/26   27    2    3/5   8/10
#11     8/10 13/15 16/18 19/21 22/24   27
#12      27   2/4   5/7   8/10 11/13 16/18
#13    16/18 21/23 24/26   27    2    5/7
#14     5/7  10/12 13/15 16/18 19/21 24/26
#15    24/26   1   2/4    5/7   8/10 13/15
#16    13/15 18/20 21/23 24/26   27   2/4
#17     2/4   7/9  10/12 13/15 16/18 21/23
#18    21/23 26/28   1    2/4   5/7  10/12
#19    10/12 15/17 18/20 21/23 24/26   1

Karl Palmen