Is meán lae traidisiúnta an rud a dtugaimid meán lae air. Gnáthchónaí toisc nach mbíonn an ré chéanna ag gach lá gréine agus an lá roimhe, mar sin bheadh meán lae an toirt difriúil i gcónaí, difríocht de chúpla soicind ach má ríomhtar é thar thréimhse míonna is féidir fiú 15 nóiméad a bhaint amach. Is féidir leis an difríocht idir meán lae gréine agus meán lae traidisiúnta ar Mars, mar shampla, a bheith chomh fada le 50 nóiméad Cuimsíonn cothromóid ama an difríocht seo.
Tá túr beag le dhá chlog ar an mbealach isteach chuig an Convitto Vittorio Emanuele go Piazza Dante. Tá an clog beag, a rinneadh sa bhliain 1853, uathúil san Eoraip toisc gur ionann é agus cothromóid ama.
(I rith na bliana, luainíonn an t-am atá léirithe ag dhiailiú gréine maidir lena shreabhadh rialta arna léiriú ag clog ar luach idir +16 nóiméad agus 33 soicind (idir 31 Deireadh Fómhair agus 1 Samhain) go -14 nóiméad agus 6 soicind (idir 11 agus 12 Feabhra), ag dul ó -3 '66" (idir 13 agus 15 Bealtaine) agus +6' 53" (25 agus 26 Iúil).
Cothromóid ama a thugtar ar an diall seo agus is iarmhairt é ar an ngníomh comhcheangailte idir chlaonadh na haise agus éalárnacht fhithis an Domhain. Is é léiriú amhairc na cothromóide seo an analemma nó lemniscate ainm eile, nuair a dhúnann an sinusoid fhoirmiú ocht).
Tá a gcothromóid shonrach ama féin ag na pláinéid eile freisin.
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