We discovered that many people, including professionals, are unable to distinguish between latitude and longitude, as well as how they relate to X and Y. This video explains the relationship and how to distinguish between X and Y, as well as answering the question; If X represents latitude or longitude.

link to previous videos
coordinate reference system    • Understanding Coordinate Reference Sy...  
GIS data Structures    • Understanding GIS Data Structures  
GIS data types    • Understanding GIS data types  
GIS component    • Understanding the components of GIS  
ArcMap User interface    • Arcmap10x user interface  

time codes
0:00 - the problem
1:12 - Plan coordinate system review
1:57 - Latitude and longitude review
2:59 - how lat and long relates to x and y
3:40 - answering what longitude is (x or y)
4:38 - answering what Latitude is (x or y)