Forgetfulness means the person was unaware, at that moment, of being in a fast. It is not identical to a mistaken estimate of sunset or to knowingly continuing an act once the fast is remembered.
A person who forgets, takes a bite, and stops on remembering comes under this clause. Continuing to eat after remembering introduces a deliberate element and cannot simply be classed as more forgetfulness.
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Kitab al-Sawm: Fasting Hours, Invalidators, Qada and Kaffarah
Forgetfulness means the person was unaware, at that moment, of being in a fast. It is not identical to a mistaken estimate of sunset or to knowingly continuing an act once the fast is remembered.
A person who forgets, takes a bite, and stops on remembering comes under this clause. Continuing to eat after remembering introduces a deliberate element and cannot simply be classed as more forgetfulness.