Are you familiar with Excel's object model? If not, I would recommend that you become familiar with it (I think the answer to most of these kind of questions is really about how to find the desired object and property/method in the object model): https://msdn.microsoft.com/en-us/lib.../ff194068.aspx
I'm not sure where you would want it to appear in your code, but the basic ideas will be:
1) Identifying which chart using the desired_workbook.charts(chart_identifier)
2) then identifying the axis .axes(xlvalue)
3) then reading the major unit of that axis .majorunit.
4) Assign that to a variable or to a cell value.
You should be able to access the help files for all of those collections, objects, and properties from the object model link above.
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