Group 1 - The event of Mars and the crescent moon appearing together, referred to as "Mars and Moon conjunction," will occur on the evening of July 28, allowing the public in China to witness this phenomenon with the naked eye if the weather is clear [1][6]. - Mars is transitioning from the constellation Leo to Virgo, and will be visible in the southwestern sky at sunset with a brightness of approximately 1.6 magnitude [3]. - The closest approach of Mars and the moon will happen around 4 AM on July 29, but this will not be visible in China as both celestial bodies will be below the horizon at that time [6]. Group 2 - Observers are advised to find open areas with minimal light pollution for better visibility of the conjunction, particularly before 10 PM when both Mars and the crescent moon will set below the horizon [7].