Brihat Samhita
दर्पण इवएकदेशे सबाष्प निःश्वासमारुतौपहतः । दृश्येतऽघ्रातं तत्सुवृष्टिवृद्ध्यावहं जगतः ॥ ५-५० ॥
If a small portion of the disc should be so slightly eclipsed as to resemble a mirror covered with the vapour of hot breath, the eclipse is known as Āghrāta (smelling): there will be good rain in the land.
english translation
darpaNa ivaekadeze sabASpa niHzvAsamArutaupahataH । dRzyeta'ghrAtaM tatsuvRSTivRddhyAvahaM jagataH ॥ 5-50 ॥
hk transliteration by Sanscript