There are several equivalent versions of the Hertzspung-Russell diagrams of stars. The horizontal axis is either the surface temperature (increasing to the left). The vertical axis measures the luminosity (increasing upwards) or absolute magnitude (increasing downwards).
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The x axis is the temperature *Kelvin. While the y axis is the luminosity of the star.
The x-axis comes first. because x comes before y.
The x-axis is the horizontal axis on a graph. The y-axis is the vertical axis on a graph.
In a Cartesian grid, the x-axis is the horizontal axis, and the y-axis is the vertical axis.
In notation of coordinates it is the x axis followed by the y axis