Saying Dua on sighting the new moon of Ramadan is an indispensable and traditional part of Muslims in Ramadan. People say dua/prayers at different times of the day and in Ramadan, they have to pray 5 times a day. Follow these prayers and say them when you sight the new moon in Ramadan.
When your eyes fall on the new moon, turn yourself towards the Qibla, raise both your hands towards the sky, and address the moon with these words.
Let's say these Ramadan duas on sighting the new moon.
When you see the new moon of Ramadhan, you may say these prayers.
When you gaze at the new moon of the month of Ramadhan, you can say these duas.
Following above compilation of Ramadan Duas for sighting the new moon so that you can say the right duas for this occasion in Ramadan. It's is important that you say the correct duas for a specific time. You can find more duas for different times of Ramadan with Some common ramadan duas in Hindi.