What is the Eastern Time Zone? The Eastern Timezone is an area 5 hours behind Greenwich Mean Time ( GMT-5 ) during the winter months (referred to as EST) and 4 hours behind Greenwich Mean Time ( GMT-4 ) during the summer months (referred to as EDT). From 2 A.M. on the second Sunday in March to 2 A.M. on the first Sunday in November, Daylight Saving Time is in effect.
WHAT ARE SINUSES? Sinuses are air pockets that are located within the bones of the skull and face and are connected to your nasal passages by small tubes or channels, the osteomeatal complex. These channels permit air to flow from the nose into the sinuses and allow drainage of mucous from each sinus into the nose.
1 Frontal-one sinus per side, located within the bone of the forehead above the level of the eyes and nasal bridge (figures 1 and 3). 2  Sphenoid-one sinus per side, located behind the ethmoid sinuses; the sphenoid is not seen in a head-on view but is better appreciated looking at a side view (figure 3).NTRODUCTION. The paranasal sinuses (âthe sinusesâ) are air-filled cavities located within the bones of the face and around the nasal cavity and eyes. Each sinus is named for the bone in which it is located: