Eb8-37:

This variant has no sign of the sun (as the normal type with a head hanging down). Therefore it should not mean autumn equinox. Instead it stands for the 'birth' of the dark season. It is used here in Keiti as an expression of the fact that after midsummer darkness will increase.

This may explain why Metoro, who started his reading of Tahua with the beginning of side b, where a viri indicates summer solstice, for once used the word hoea instead of viri.

The 'hook' at the top of this glyph may be read as GD79.

Eb8-33:

This glyph is located four places earlier than the one above (Eb8-37) and presumably we have here the opposite sign: the arrival of the season of light. The three fingers indicate light. The 'shell' below is not identical with the parallel 'shell' in Eb8-37, because its form is influenced by the idea of an arm with a hand (GD35).

On the Gateway of the Sun (in Tiahuanaco) the equinox picture of the sun god shows him holding the 'staffs' (henua) of summer and winter with his thumbs demarcating the equinoxes:

At left (from us seen - i.e. in the right hand of the sun god) we have the hand marking spring equinox, at right autumn equinox. The staff in his right hand has three short henua above spring equinox, meaning the three months from spring equinox to summer solstice. Summer solstice is at the top, the round sun symbols around his head (12 in all + 5 'extracalendrical' below his cheek) are greater close to summer solstice.

Summer solstice marks the end of the first half of the year, as shown by the semicircle on top of the left staff. The two staffs are half-years. The staff in his left hand is the second half year. From autumn equinox to spring equinox darkness dominates over light and therefore we have 3 dark henua in the bottom (winter) halves of the staffs.