f67v2: the lunar - solar tides

[Searcher]

... and twice in a year. 

No, only twice per month, namely when sun, moon and earth are (approximately) on one line.
The official name is twice per synodic month, and this is about 29.5 days long.

I was sure that the annual tides also are named spring.  Maybe, it is just my headache, provoced by cyclone and wind. 
 Exactly Bede, in "De Temporum ratione" , the diagram of which was mentioned earlier, noted the increase of tides at the equinoxes and their decrease at the solstices. It is strange that he didn't draw this grafically. Possibility, it is because he initially thought ("De natura rerum") that the tides are increased at equinoxes and at solstices either. So, it was a questionable moment.