Synchronous communication is any form of communication that requires an immediate response, such as phone calls, video calls, or live chat. Synchronous communication can be useful for communicating across time zones when you need to discuss complex or urgent issues, brainstorm ideas, build rapport, or make decisions. However, synchronous communication can also be challenging, as it may require you to adjust your schedule, deal with technical issues, or cope with fatigue. Therefore, you should schedule synchronous communication carefully, and only when necessary. You should also consider the time zone differences, the agenda, the duration, and the participants of the meeting, and use tools like calendars, reminders, and time zone converters to plan ahead.