I have went through the below steps:
1 - Exporting KML file from Google earth with some points.
2 - applying Excel to table & the resulted table was appeared in a data frame where a base map is available.
3 - Displaying X,Y Coordinates (taking into consideration that the appeared coordinated system in - display X&Y coordinates window - is the same as that of the data frame witch was:
Projected Coordinate System:
Name: WGS_1984_Web_Mercator_Auxiliary_Sphere
Geographic Coordinate System:
Name: GCS_WGS_1984
4 - Although the similarity in both geographical coordinate system & the projected one between the base map & the resulted event but the resulted event appeared in the ocean below Ghana & Nigeria witch is away from its correct location.
By the way, if i make edit and applied only the same Geographical coordinated witch is (GCS_WGS_1984) without the projected one, it gives the right location.
But I'm wondering why in case applying the same geographical & projected system of the base map, it doesn't match with the real location?
Appreciating your answer.
Regards
What were the units that you extracted from Google Earth? (where coordinates in meters/dedimal degrees)
It sounds like you added some coordinates from a geographic coordinate system to a projected system where the origin of the projected system is a 0 degree long and 0 degree lat (hence why the points have plotted off West Africa)
The following blog might be a good place to start?