Kays 210:16 :ܫܕܐ ܥܠܘܗܝ ܕܟܘܟܒܐ ܗ݀ܘ ܗܦܝ݂ܟܐ ܙܠ̈ܝ݂ܩܐ ܡ݂ܢ ܒܣܬܪܗ܂ ܡ݂ܢ ܛܪܝܓܢܘ݁ܢ ܡܥܪܒܝܐ‏ : (the sun) throws its rays on that backwards (moving) planet from behind it, from the western quarter of the sky
See the entire entry for ṭrīgōn, ṭrīgōnā n.m. triangle; region