The lunar orbit

Judging by the very high quality of Spanish tuition offered by Kwiziq, I'm sure that you would like to ensure that your texts, too, always convey correct information. A "lunation" takes about 29½ days [this is an average, sometimes it can be several hours longer, or shorter] - not 28. So the moon does not perform 13 orbits every year. Instead, 12 of its circuits are completed in 354 days, so an Islamic year is usually about 11 days shorter than [our] Gregorian year.