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.
When the overall blood volume falls so does oneâs blood pressure. Low blood pressure is a leading cause of dizziness and feeling like you may faint when you stand up. A rapid heart rate is also a sign of dehydration. The heart rate increases in attempts to maintain and elevate blood pressure.