<P> Various computations of the dog days have placed their start anywhere from 3 July to 15 August and lasting for anywhere from 30 to 61 days . They may begin or end with the cosmical or heliacal rising of either Sirius in Canis Major or Procyon ( the `` Little Dog Star '' ) in Canis Minor and vary by latitude , not even being visible throughout much of the Southern Hemisphere . Sirius observes a period of almost exactly 3651⁄4 days between risings , keeping it largely consistent with the Julian but not the Gregorian calendar ; nonetheless , its dates occur somewhat later in the year over a span of millennia . </P>
<P> Various computations of the dog days have placed their start anywhere from 3 July to 15 August and lasting for anywhere from 30 to 61 days . They may begin or end with the cosmical or heliacal rising of either Sirius in Canis Major or Procyon ( the `` Little Dog Star '' ) in Canis Minor and vary by latitude , not even being visible throughout much of the Southern Hemisphere . Sirius observes a period of almost exactly 3651⁄4 days between risings , keeping it largely consistent with the Julian but not the Gregorian calendar ; nonetheless , its dates occur somewhat later in the year over a span of millennia . </P>
when do the dog days of summer start and end
when do the dog days of summer start and end
3 July to 15 August
3 July to 15 August