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Gerīmbōc is endebyrdnes tō getitelienne gerīmbōce dagas tō dagum. Þā tælmearca ārīsen fram þǣre undergietenan styrunge steorlicra þinga. Gerīmbōc is ēac fæst begīeming (oft paper), þe gebisenaþ þā endebyrdnesse (for bisne, desktop gerīmbōc). Man brȳcþ ēac þæt ƿord tō tācnienne sum rīm gesierƿodra belimpa (for bisne, dōmgerīmbōc).

Gerīmbōcendebyrdnessa 
Mǣst þāra gerīmbōca þe man brȳcþ on eorðan sind mōnelic, sunnlic,  mōnesunnlic oþþe arbitrary.

 Mōnelic gerīmbōc fylgaþ þæs mōnan styrunge (moon phases); bīspell is sēo Islamisce gerīmbōc.  

 Sunnlic gerīmbōc fylgaþ tīdlice onƿendunge þære sunnan styrunge þe man siehþ; bīspell is sēo Persisce gerīmbōc.

 Mōnasunnlic gerīmbōc fylgaþ þæs mōnan and þǣre sunnan styrunge; bīspell is sēo Iudēisce gerīmbōc.

 Arbitrary gerīmbōc ne fylgaþ þæs mōnan and ne þǣre sunnan styrunge; bīspellan sind sēo ƿucu, and se Iūlisca dæg þe tungolǣmenn brūcaþ.

Sume gerīmbēc þyncaþ fylgian Venuses styrunge; bīspellan sind sume þāra ealdra Ǣgyptiscra gerīmbōca; þynceþ þæt menn dōþ þūs mǣste nēah þǣm Equator.