Oct 20, 2014
From the HAP website: The neutrino experiment Borexino in the INFN Gran Sasso Laboratories has managed to measure the energy of our star in real time: the energy released today at the centre of the Sun is exactly the same as that produced 100,000 years ago. -- The Sun as Borexino Sees It in Real Time http://www.hap-astroparticle.org/news.php#block405
(picture credit: INFN - Borexino Collaboration)