In an effort to allow for this discrepancy, many baroque ensembles adjust their tuning to the repertoire being performed: aâ= 415hz for late baroque music, aâ=392hz for French music, aâ=440hz for early Italian music and aâ=430hz for classical repertoire.
Ultrasound uses the size of the fetus to determine the gestational age (the time elapsed since the the first day of the last menstrual period). The accuracy of the ultrasound estimate of the gestational age varies according to the gestational age.Ultrasound measurement of the embryo or fetus in the first trimester (up to and including 13 6/7 weeks of gestation) is the most accurate method to establish or confirm gestational age [24].ltrasound uses the size of the fetus to determine the gestational age (the time elapsed since the the first day of the last menstrual period). The accuracy of the ultrasound estimate of the gestational age varies according to the gestational age.
At around 18 to 20 weeks, you will have an ultrasound to check your babyâs development, identify any problems, and possibly even identify the sex of your baby. Itâs important to remember that it is not always possible to determine the sex of your baby at this stage and you wonât know for sure until your baby is born. To determine the sex of your baby, the ultrasound technician or obstetrician will look for the presence or absence of a penis on the ultrasound. Keep in mind that this method of determining the sex of your baby is not 100% accurate. A visual effect may create or obscure the image of a penis on an ultrasound.