caturthI tithi
on a Tuesday is as sacred as a solar eclipse. Good day for doing puja of Ganesha/Subrahmanya with naivedyam of modakam/millet flour respectively.
अमावस्या तु सोमेन सप्तमी भानुना सह। चतुर्थी भूमिपुत्रेण सोमपुत्रेण चाष्टमी। चतस्रस्तिथयस्त्वेताः सूर्यग्रहणसन्निभाः॥