  We report the discovery of a compact triply eclipsing triple star system in
the southern continuous viewing zone of the TESS space telescope. TIC 278825952
is a previously unstudied, circular eclipsing binary with a period of 4.781
days with a tertiary component in a wider, circular orbit of 235.55 days period
that was found from three sets of third-body eclipses and from light
travel-time effect dominated eclipse timing variations. We performed a joint
photodynamical analysis of the eclipse timing variation curves, photometric
data, and the spectral energy distribution, coupled with the use of PARSEC
stellar isochrones. We find that the inner binary consists of slightly evolved,
near twin stars of masses of 1.12 and 1.09 $M_\odot$ and radii of 1.40 and 1.31
$R_\odot$. The third, less massive star has a mass of 0.75 $M_\odot$ and radius
of 0.70 $R_\odot$. The low mutual inclination and eccentricities of the orbits
show that the system is highly coplanar and surprisingly circular.
