>>> In what month and year did the Texas Longhorn's accept an invitation to the SEC? 

- elapsed 2.763 seconds -

Based on the context provided, the Texas Longhorns accepted an invitation to join the SEC in August 2023. Here's why: The Big 12 announced in February 2023 that Texas and Oklahoma had negotiated a combined $100 million early termination fee to leave the conference a year early, in 2024. This announcement was made before the schools' media rights deal with the Big 12 was set to expire in 2025. The fact that the Big 12 made this announcement suggests that the schools had already accepted their invitations to join the SEC, possibly as early as when they negotiated the early termination fee in February 2023. Therefore, the Texas Longhorns accepted an invitation to join the SEC in August 2023, when the Big 12 made the public announcement.