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curves of two EA-type eclipsing binaries, TY Peg and X Tri, are formed and studied in O Ϫ C detail based on all available times of light minimum. For TY Peg, it was discovered that the general trend of the curve showed a downward parabolic variation, which indicates a secular period decrease with rate at O Ϫ C days yr Ϫ1 . When the secular decrease is removed from the curve, the residuals can Ϫ6 dP/dt p Ϫ1.16 # 10 O Ϫ C be described by several linear ephemerides, suggesting several suddendoi:10.1086/341681 fatcat:ulqpdm6n4vfrlifwvbajmbs4wu