In some cultures in the Northern Hemisphere, the astronomical March equinox (varying between 19 and 21 March) is taken to mark the first day of spring, and the Northern solstice (around 21 June) is taken as the first day of summer. In other traditions, the equinox is taken as mid-spring.
Circulation problems that cause dizziness. You may feel dizzy, faint or off balance if your heart isn't pumping enough blood to your brain. Causes include: 1  Drop in blood pressure.
1 Drop in blood pressure (orthostatic hypotension). 2  A dramatic drop in your systolic blood pressure â the higher number in your blood pressure reading â may result in light-headedness or a feeling of faintness. 3  It can occur after sitting up or standing too quickly.oss of balance (disequilibrium). Disequilibrium is the loss of balance or the feeling of unsteadiness when you walk. Causes may include: 1  Inner ear (vestibular) problems. 2  Abnormalities with your inner ear can cause you to feel like you are floating, have a heavy head or are unsteady in the dark.