kalispera, ypraxoun dyo systimata ypologismou. To prwto einai " mia moira to xrono",diladi proxwras ton kathe planiti sto genethlio xarti sou kata mia moira to xrono, an px eisai 30 etwn, tote o kathe planitis sou exei proxwrisei 30 moires brosta.
me to deftero tropo ypologismou, oi theseis twn planitwn apo tin epomeni mera tis genisis sou adistoixoun ston kathe xrono tis zwis sou, p.x. i epomeni mera apo afti pou genithikes adistoixei sto prwto etos tis zwis sou, i methepomeni sto deftero kok.,xxx
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