छायाभूमौ विपर्यस्ते स्वच्छायाग्रे तु दर्शयेत् । ग्रहः स्वदर्पणान्तःस्थः शङ्क्वग्रे सम्प्रदिश्यते॥
On a surface keep a cone (çanku) and show the sine of zenith distance and tip of the shadow on the other side. If at the extremity of the shadow you keep a mirror, then, you can see the planet on the other side of the mirror and the tip of the cone in a same straight line in the mirror.
english translation
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