It is estimated that per minute each $cm^2$ of earth receives about $2\ cal (1\ cal = 4.18\ J)$ of heat energy from the sun. This is called Solar constant. In $SI$ units the value is
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Solar constant $=2$ $cal/cm^{2}-min$
$2 \mathrm{cal} /cm^2-min=\mathrm{X} \mathrm{J} / \mathrm{m}^{2}-\mathrm{sec}$
$X=2$
$\left(\frac{\mathrm{cal}}{\mathrm{J}}\right)\left(\frac{\mathrm{sec}}{\min }\right)\left(\frac{\mathrm{m}^{2}}{\mathrm{cm}^{2}}\right)$
$=2(4.18)\left(\frac{1}{60}\right)(10000)=1393.33$
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