Pregnancy Weight Gain: Facts. 1  For women who were a normal weight before pregnancy with a BMI of 18.5-24.9 the recommended weight gain guideline is 25-35 pounds. 2  Women who are underweight pre-pregnancy with a BMI of less than 18.5 should gain between 28-40 pounds unless your health care provider says differently.
Tilth generally refers to the physical condition of the soil as it relates to plant growth. Favorable tilth implies good conditions for seed germination and root proliferation, allowing crops to thrive.
A planet's axial tilt is a measure of whether the planet is in prograde (the natural direction of rotation of most bodies in our solar system) or retrograde (the opposite, ie, from East to West) rotation. Tilt angle is measured relative to the orbital plane of a planet. A tilt between 1 to 90 degrees is considered prograde rotation (Earth's tilt is 23 degrees, in prograde rotation), a tilt of 90 degrees is considered perpendicular, and neither prograde or retrograde.