Is the person who sights the new moon of Ramadaan on his own obliged to fast?

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Check below answers in case you are looking for other related questions:
If they did not find out that the month of Ramadan had begun until partway through the day, what should they do?
They did not see the new moon of Dhu’l-Hijjah – what should they do?

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If they did not find out that the month of Ramadan had begun until partway through the day, what should they do?
They did not see the new moon of Dhu’l-Hijjah – what should they do?

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