Many have _-u_ in the dat. sg.: _sōl_ (sun), _sōl_, _sōlu_,— Icelandic Primer with Grammar, Notes and Glossary
The following words, however, have a long vowel: sāl, sōl, Lār, pār, vēr, fūr, dīc, dūc, ēn, nōn, quīn, sīn, sīc, cūr.— New Latin Grammar
Ille sōl, istī oculī calamītātēs nostrās vīdērunt. [— Latin for Beginners
23, 2. socium, gen, plu., 25, 6, c). sōl, decl.,— New Latin Grammar
«sōl, sōlis», m., _sun_ (solar) «vērus, - a, - um», _true, real_ (verity) «dēbeō, dēbēre, dēbuī, dēbitus», _owe, ought_ (debt) «ēripiō, ēripere, ēripuī, ēreptus», _snatch from_— Latin for Beginners
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