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1 "Vasa horoscopica." "Vasa horoscopica appellat horologia in plano descripta, horizonti ad libellam respondentia. Vasa dicuntur, quod area in qua lineæ ducebantur, labri interdum instar et conchæ erat, cujus in margine describebantur horæ. Horoscopa, ab ὥρα et σκοπέω, hoc est, ab inspiciendis horis." Hardouin, in Lemaire, i. 391.
2 These distances are respectively about 38 and 62 miles.
3 We are not to expect any great accuracy in these estimates, and we accordingly find, that our author, when referring to the subject in his 6th book, ch. 39, makes the shadow at Ancona 1/35 greater than the gnomon, while, in Venetia, which is more northerly, he says, as in the present chapter, that the shadow and the gnomon are equal in length. See the remarks of M. Alexandre in Lemaire, ut supra.
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