How can I center the equation in the "description" environment

Question

I am a new LaTeX user.
When I tried to use the "description" environment in the Beamer, I found that the equations under each item are not centered on the page. How can I solve this problem?
Thank you
documentclass[mathserif]{beamer}
usepackage{graphicx}
usepackage{float}
usepackage{subcaption}
usepackage{caption}
usepackage{color}
usetheme{Madrid}
usecolortheme{spruce}
title{Geometry}
newcommand{diff}{,mathrm{d}}
begin{document}
frame{titlepage}
begin{frame}[t]
frametitle{Fundamentals}
begin{description}
    item[Spherical to Cartesian Coordinates]
    begin{align}
        x &= sintheta cosphi
        y &= sintheta sinphi
        z &= costheta
    end{align}
    
    item[Differential Solid Angle]
    begin{equation}
        diff Omega = sintheta difftheta diffphi
    end{equation}
end{description}
end{frame}
end{document}

egreg · Answer

You can use the same trick as amsart.
documentclass[mathserif]{beamer}
usepackage{graphicx}
usepackage{float}
usepackage{subcaption}
usepackage{caption}
usepackage{color}
usetheme{Madrid}
usecolortheme{spruce}
newcommand{diff}{mathop{}!mathrm{d}}

everydisplay=expandafter{expandafterfullwidthdisplaytheeverydisplay}
newcommand{fullwidthdisplay}{displayindent=0pt displaywidth=columnwidth}

title{Geometry}

begin{document}

frame{titlepage}

begin{frame}[t]
frametitle{Fundamentals}
[
        diff Omega = sintheta difftheta diffphi
]
begin{description}
    item[Spherical to Cartesian Coordinates]
    begin{align}
        x &= sintheta cosphi
        y &= sintheta sinphi
        z &= costheta
    end{align}
    
    item[Differential Solid Angle]
    begin{equation}
        diff Omega = sintheta difftheta diffphi
    end{equation}
end{description}
end{frame}

end{document}

I added the first equation to better show the centering.
I also modified your diff command to only add a thin space when necessary.

How can I center the equation in the "description" environment

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