Hi Jean, well here's a new year's treat for you...
It looks like something is missing with the Sun/Earth transit events when I do a helio transit-transit search for aspects. Below is a sample. Note that the Sun positions are always 0 Ari 0 (so it's the transiting Aries point :-). And there's something I found that seems related, very rare: A chart with a stationary Sun! See attachment, I just clipped the table of planetary positions for a current helio chart. (Also, the Sun symbol would ideally be replaced with Earth for helio, like it is in the wheel.)
02/01/1920 03:34 Sun Sex Mer exact 00°00'00" Ari 00°00'00" Aqu
02/01/1920 03:34 Mer Aqu
02/01/1920 07:59 Ven Tri Plu exact 06°49'44" Sco 06°49'44" Can
02/01/1920 15:46 Ven Sex Sat exact 07°20'54" Sco 07°20'54" Vir
02/03/1920 10:06 Ven Squ Nep exact 10°10'26" Sco 10°10'26" Leo
02/04/1920 05:50 Mer Opp Nep exact 10°10'44" Aqu 10°10'44" Leo
02/04/1920 23:03 Mer Squ Ven exact 12°38'23" Aqu 12°38'23" Sco
02/05/1920 03:33 Mer Opp Jup exact 13°17'21" Aqu 13°17'21" Leo
02/05/1920 09:04 Ven Squ Jup exact 13°18'27" Sco 13°18'27" Leo
02/09/1920 16:38 Mer Pis
02/10/1920 02:06 Mer Con Ura exact 01°32'48" Pis 01°32'48" Pis
02/11/1920 09:48 Mer Tri Plu exact 06°51'35" Pis 06°51'36" Can
02/11/1920 14:42 Mer Opp Sat exact 07°41'55" Pis 07°41'55" Vir
02/13/1920 23:58 Sun Opp Mar exact 00°00'00" Ari 29°59'59" Vir
02/13/1920 23:58 Mar Lib
02/15/1920 20:02 Sun Tri Ven exact 00°00'00" Ari 29°59'59" Sco
02/15/1920 20:02 Ven Sag
02/16/1920 13:10 Ven Sex Mar exact 01°08'11" Sag 01°08'11" Lib
02/16/1920 14:56 Sun Con Mer exact 00°00'00" Ari 29°59'59" Pis
02/16/1920 14:56 Mer Ari
02/16/1920 20:27 Ven Squ Ura exact 01°37'10" Sag 01°37'10" Pis