That depends on where along 15 degrees east and where along 15 degrees west.
15 degrees east passes through Svalbard, where the time is UTC+0 from Oct. to Mar. & UTC+1 from Mar. to Oct., Norway, Sweden, Poland, Germany, the Czech Republic, Austria, Slovenia, Croatia & Italy, where the time is UTC+1 from Oct. to Mar. & UTC+2 from Mar. to Oct., Libya, where the time is always UTC+2, Niger, Chad, Cameroon, the Central African Republic, Congo, D.R. Congo & Angola, where the time is always UTC+1, and Namibia, where the time is UTC+1 from Apr. to Sep. & UTC+2 from Sep. to Apr.
Likewise, 15 degrees west passes through several different time zones ranging from UTC-3 to UTC+1.
So between Oct. & Mar., when it's 10 AM at 15 degrees east longitude in Svalbard, it's 10 AM at 15 degrees west longitude in Iceland, the Canary Islands, Western Sahara, Mauritania, Senegal, the Gambia, Guinea-Bissau & Guinea. Also between Oct. & Mar., when it's 10 AM EET at 15 degrees east longitude in Libya, it's 5 AM WGT at 15 degrees west longitude in Greenland.
If it is 10 am at 45 degrees W longitude, it is 4 pm at 45 E longitude.
10AM PST is 1PM EST
If it is 4 a.m. at 15 degrees east, we need to calculate the time difference with 30 degrees west. The Earth is divided into 360 degrees of longitude, with each hour representing 15 degrees. Traveling from 15 degrees east to 30 degrees west is a difference of 45 degrees, which is equivalent to 3 hours. Therefore, if it is 4 a.m. at 15 degrees east, it would be 1 a.m. at 30 degrees west.
It is 2pm. Every 15 degrees of longitude is a different time zone, since there are 360 degrees of longitude on Earth and 24 hours a day (360/24). Here, there is a 90 degrees difference in longitude, and therefore a 6 hours difference (90/6). The time gets later as it approaches the International Date Line from the east, therefore, since 150 degrees east is east to 60 degrees east longitude, the time is 6 hours after it.
When it is noon in Wellington (175 degrees East), it is 11:00 PM the previous day in a location at 175 degrees West. This is because the Earth is divided into 24 time zones, each representing 15 degrees of longitude, and moving from 175 degrees East to 175 degrees West is a full 360 degrees, or 24 hours. Therefore, there is a 24-hour difference between these two longitudes.
If it is 10 am at 45 degrees W longitude, it is 4 pm at 45 E longitude.
10AM PST is 1PM EST
If it is 4 a.m. at 15 degrees east, we need to calculate the time difference with 30 degrees west. The Earth is divided into 360 degrees of longitude, with each hour representing 15 degrees. Traveling from 15 degrees east to 30 degrees west is a difference of 45 degrees, which is equivalent to 3 hours. Therefore, if it is 4 a.m. at 15 degrees east, it would be 1 a.m. at 30 degrees west.
2 a.m
9 00
It is 2pm. Every 15 degrees of longitude is a different time zone, since there are 360 degrees of longitude on Earth and 24 hours a day (360/24). Here, there is a 90 degrees difference in longitude, and therefore a 6 hours difference (90/6). The time gets later as it approaches the International Date Line from the east, therefore, since 150 degrees east is east to 60 degrees east longitude, the time is 6 hours after it.
When it is noon in Wellington (175 degrees East), it is 11:00 PM the previous day in a location at 175 degrees West. This is because the Earth is divided into 24 time zones, each representing 15 degrees of longitude, and moving from 175 degrees East to 175 degrees West is a full 360 degrees, or 24 hours. Therefore, there is a 24-hour difference between these two longitudes.
9:00
Places in the east are ahead in time due to the rotation of the Earth. Each time zone is roughly 15 degrees of longitude wide, and because the Earth rotates from west to east, places further east experience sunrise and sunset earlier than places further west.
Time zones are ideally 15 degrees in width, so that 24 will cover the entire 360 degrees (180 east and 180 west)
For every 15 degrees of longitude difference, there is approximately a one-hour time difference. Therefore, places that are 60 degrees east of your home would be about 4 hours ahead of your home time, while places that are 60 degrees west would be about 4 hours behind.
The solar times for both persons would be different due to the time zone difference. The person 3 degrees west of the Moon meridian would experience a solar time that is about 12 minutes behind the standard time, while the person 5 degrees east would be about 20 minutes ahead of the standard time. This is due to the Earth's rotation causing changes in solar time as we move east or west from the standard meridian.