Mark Significant Dates In The 2025 Year Ahead. Mark your 2025 calendar with key health observances! So go ahead — pull out your calendar, or your 2025 astro planner, and highlight the dates you want to pay attention to this year.

The 2025 calendar is packed with holidays, notable observances, and opportunities to celebrate or reflect. The first 25 years of any century feel a bit foundational.